Method and apparatus for determining of transmission resources for uplink channels of use for dual connectivity in wireless communication system

ABSTRACT

The disclosure relates to a communication method and a system for converging a 5 th -Generation (5G) communication system for supporting higher data rates beyond a 4 th -Generation (4G) system with a technology for Internet of Things (IoT). The disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as a smart home, a smart building, a smart city, a smart car, a connected car, health care, digital education, a smart retail, security and safety services. A method performed by a terminal in a wireless communication system is provided. The method includes receiving a higher signal including a plurality of physical uplink control channel (PUCCH) resource information, determining a PUCCH format and resource for a hybrid automatic repeat request (HARQ) feedback information corresponding to a physical downlink shared channel (PDSCH), and transmitting the HARQ feedback information based on the determined PUCCH format and the resource.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application is a continuation application of prior application Ser.No. 16/861,999, filed on Apr. 29, 2020, which has issued as U.S. Pat.No. 11,290,991 on Mar. 29, 2022 and is based on and claims priorityunder 35 U.S.C. § 119(a) of a Korean patent application number10-2019-0051359, filed on May 2, 2019, in the Korean IntellectualProperty Office, and of a Korean patent application number10-2019-0112871, filed on Sep. 11, 2019, in the Korean IntellectualProperty Office, the disclosure of each of which is incorporated byreference herein in its entirety.

BACKGROUND 1. Field

The disclosure relates to a method and an apparatus for determiningresources for dual connectivity in a wireless communication system. Moreparticularly, the disclosure relates to a method and an apparatus fortransmitting uplink channels for dual connectivity in a wirelesscommunication system.

2. Description of Related Art

To meet the demand for wireless data traffic having increased sincedeployment of 4th generation (4G) communication systems, efforts havebeen made to develop an improved 5th generation (5G) or pre-5Gcommunication system. Therefore, the 5G or pre-5G communication systemis also called a ‘Beyond 4G Network’ or a ‘Post LTE System’. The 5Gcommunication system is considered to be implemented in higher frequency(mmWave) bands, e.g., 60 GHz bands, so as to accomplish higher datarates. To decrease propagation loss of the radio waves and increase thetransmission distance, the beamforming, massive multiple-inputmultiple-output (MIMO), Full Dimensional MIMO (FD-MIMO), array antenna,an analog beam forming, large scale antenna techniques are discussed in5G communication systems. In addition, in 5G communication systems,development for system network improvement is under way based onadvanced small cells, cloud Radio Access Networks (RANs), ultra-densenetworks, device-to-device (D2D) communication, wireless backhaul,moving network, cooperative communication, Coordinated Multi-Points(CoMP), reception-end interference cancellation and the like. In the 5Gsystem, Hybrid FSK and QAM Modulation (FQAM) and sliding windowsuperposition coding (SWSC) as an advanced coding modulation (ACM), andfilter bank multi carrier (FBMC), non-orthogonal multiple access (NOMA),and sparse code multiple access (SCMA) as an advanced access technologyhave been developed.

The Internet, which is a human centered connectivity network wherehumans generate and consume information, is now evolving to the Internetof Things (IoT) where distributed entities, such as things, exchange andprocess information without human intervention. The Internet ofEverything (IoE), which is a combination of the IoT technology and theBig Data processing technology through connection with a cloud server,has emerged. As technology elements, such as “sensing technology”,“wired/wireless communication and network infrastructure”, “serviceinterface technology”, and “Security technology” have been demanded forIoT implementation, a sensor network, a Machine-to-Machine (M2M)communication, Machine Type Communication (MTC), and so forth have beenrecently researched. Such an IoT environment may provide intelligentInternet technology services that create a new value to human life bycollecting and analyzing data generated among connected things. IoT maybe applied to a variety of fields including smart home, smart building,smart city, smart car or connected cars, smart grid, health care, smartappliances and advanced medical services through convergence andcombination between existing Information Technology (IT) and variousindustrial applications.

In line with this, various attempts have been made to apply 5Gcommunication systems to IoT networks. For example, technologies, suchas a sensor network, Machine Type Communication (MTC), andMachine-to-Machine (M2M) communication may be implemented bybeamforming, MIMO, and array antennas. Application of a cloud RadioAccess Network (RAN) as the above-described Big Data processingtechnology may also be considered to be as an example of convergencebetween the 5G technology and the IoT technology.

Accordingly, various attempts have been made to apply a 5G communicationsystem to an IoT network. For example, 5G communication technology, suchas a sensor network, machine-to-machine communication (M2M), andmachine-type communication (MTC), is implemented by techniques, such asbeamforming, MIMO, and array antenna. The application of a cloud radioaccess network (cloud RAN) as big-data processing technology describedabove is an example obtained by converging 5G technology and IoTtechnology.

Meanwhile, various studies have been conducted on a method fortransmitting an uplink control channel in a communication system. Inparticular, a method for transmitting a physical uplink control channel(PUCCH) and a physical uplink shared channel (PUSCH) is discussed fromvarious aspects.

The above information is presented as background information only toassist with an understanding of the disclosure. No determination hasbeen made, and no assertion is made, as to whether any of the abovemight be applicable as prior art with regard to the disclosure.

SUMMARY

A user equipment (UE) capable of performing dual connectivity for longterm evolution (LTE) and a new radio (NR) may separately transmit orreceive data to or from LTE and NR cells.

Aspects of the disclosure are to address at least the above-mentionedproblems and/or disadvantages and to provide at least the advantagesdescribed below. Accordingly, an aspect of the disclosure is to providea method and an apparatus which enables a UE having dynamicpower-sharing capability for uplink transmission to determine whichuplink transmission is to be prioritized in the case where LTE and NRuplink transmissions temporally collide with each other although the LTEand NR uplink transmissions by the UE are not limited to a specificsubframe or slot. A UE having semi-static power-sharing capability foruplink transmission performs LTE uplink transmission and NR uplinktransmission in a time-division method. At this time, the UE may receivea first configuration that enables uplink transmission to be performed,for the LTE cell, only in a specific subframe, and according to thefirst configuration, hybrid automatic repeat request-acknowledgement(HARQ-ACK) for downlink data is limited to being transmitted only in thespecific subframe. If a UE having semi-static power-sharing capabilitytransmits uplink data, the location of a subframe performing initialtransmission and retransmission may be the same or different for eachradio frame according to the time division duplex (TDD) uplink-downlink(UL-DL) configuration of the LTE cell. Accordingly, by applying anothersecond configuration according to the TDD UL-DL configuration of the LTEcell, a method and an apparatus for performing initial transmission andretransmission of LTE uplink data only in a limited specific subframeaccording to the first configuration are provided. In addition, if a UEreceives only physical downlink shared channel (PDSCH) through onephysical downlink control channel (PDCCH) in an LTE primary cell,receives only one PDCCH for DL semi persistent scheduling (SPS) release,or receives only one PDSCH without a corresponding PDCCH, a method andan apparatus for determining a plurality of physical uplink controlchannel (PUCCH) transmission resource of PUCCH format 3/4/5 areprovided.

Additional aspects will be set forth in part in the description whichfollows and, in part, will be apparent from the description, or may belearned by practice of the presented embodiments.

In accordance with an aspect of the disclosure, a method performed by aterminal in a wireless communication system is provided. The methodincludes receiving a higher signal including a PUCCH resourceinformation, determining a PUCCH format and resource for a hybridautomatic repeat request (HARQ) feedback information corresponding to aPDSCH and transmitting the HARQ feedback information based on thedetermined PUCCH format and the resource, wherein the PUCCH format usesa preset format and the resource corresponds to a first PUCCH resourceamong the plurality of PUCCH resource information, in case that Evolveduniversal mobile telecommunications system (UMTS) Terrestrial RadioAccess (EUTRA) new radio (NR)-dual connectivity (EN-DC) is set in theterminal, time division duplex (TDD) frame structure is set in a primarycell (PCell) of the terminal, a reference TDD configuration informationis set in the terminal, and a downlink assignment index (DAI) fieldvalue of a DCI format corresponding to the PDSCH is set in 1.

In accordance with another aspect the disclosure, a method performed bya base station in a wireless communication system is provided. Themethod includes transmitting, to a terminal, a higher signal including aplurality of PUCCH resource information, transmitting, to the terminal,a PDSCH and receiving, from the terminal, a HARQ feedback informationcorresponding to the PDSCH based on a PUCCH format and resource, whereinthe PUCCH format uses a preset format and the resource corresponds to afirst PUCCH resource among the plurality of PUCCH resource information,in case that Evolved UMTS EUTRA NR-EN-DC is set in the terminal, TDDframe structure is set in a PCell of the terminal, a reference TDDconfiguration information is set in the terminal, and a DAI field valueof a DCI format corresponding to the PDSCH is set in 1.

In accordance with another aspect of the disclosure, a terminal in awireless communication system is provided. The terminal includes atransceiver and a controller configured to receive, via the transceiver,a higher signal including a PUCCH resource information, to determine aPUCCH format and resource for a HARQ feedback information correspondingto a PDSCH, and to transmit, via the transceiver, the HARQ feedbackinformation based on the determined PUCCH format and the resource,wherein the PUCCH format uses a preset format and the resourcecorresponds to a first PUCCH resource among the plurality of PUCCHresource information, in case that Evolved UMTS EUTRA NR-EN-DC is set inthe terminal, TDD frame structure is set in a PCell of the terminal, areference TDD configuration information is set in the terminal, and aDAI field value of a DCI format corresponding to the PDSCH is set in 1.

In accordance with another aspect of the disclosure, a base station in awireless communication system is provided. The method includes atransceiver and a controller configured to transmitting, to a terminalvia the transceiver, a higher signal including a plurality of PUCCHresource information, to transmit, to the terminal via the transceiver,a PDSCH, and to receive, from the terminal via the transceiver, a HARQfeedback information corresponding to the PDSCH based on a PUCCH formatand resource, wherein the PUCCH format uses a preset format and theresource corresponds to a first PUCCH resource among the plurality ofPUCCH resource information, in case that Evolved UMTS EUTRA NR-EN-DC isset in the terminal, TDD frame structure is set in a primary cell(PCell) of the terminal, a reference TDD configuration information isset in the terminal, and a DAI field value of a DCI format correspondingto the PDSCH is set in 1.

In accordance with another aspect of the disclosure, a method and anapparatus for determining resources for dual connectivity in a wirelesscommunication system may be provided. In addition, according to anembodiment of the disclosure, a method and an apparatus for transmittingan uplink channel for a UE for dual connectivity in a wirelesscommunication system may be provided.

Other aspects, advantages, and salient features of the disclosure willbecome apparent to those skilled in the art from the following detaileddescription, which, taken in conjunction with the annexed drawings,discloses various embodiments of the disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects, features, and advantages of certainembodiments of the disclosure will be more apparent from the followingdescription taken in conjunction with the accompanying drawings, inwhich:

FIG. 1 illustrates a basic structure of a time-frequency domain in along term evolution (LTE) system according to an embodiment of thedisclosure;

FIG. 2 illustrates an operation of a subframe in an LTE time divisionduplex (TDD) frame according to an embodiment of the disclosure;

FIG. 3 illustrates an operation of a subframe in an LTE TDD frameaccording to an embodiment of the disclosure;

FIG. 4 illustrates an operation in which 5th generation (5G) servicesare multiplexed in one system and transmitted according to an embodimentof the disclosure;

FIG. 5 illustrates a communication system configuration to which thedisclosure is applied according to an embodiment of the disclosure;

FIG. 6 illustrates an NR uplink transmission and an LTE uplinktransmission according to an embodiment of the disclosure;

FIG. 7 illustrates an uplink transmission according to Embodiment 1according to an embodiment of the disclosure;

FIG. 8 illustrates an uplink transmission according to Embodiment 2according to an embodiment of the disclosure;

FIG. 9A illustrates a base station procedure according to an embodimentof the disclosure;

FIG. 9B illustrates a user equipment (UE) procedure according to anembodiment of the disclosure;

FIG. 10 illustrates addressing an issue of concern where an evolveduniversal mobile telecommunications system (UMTS) terrestrial radioaccess (EUTRA) new radio (NR)-dual connectivity (EN-DC) UE transmits orreceives data to or from base stations described in FIG. 5 through acell having a certain configuration according to an embodiment of thedisclosure;

FIG. 11 illustrates a base station according to an embodiment of thedisclosure; and

FIG. 12 illustrates a UE according to an embodiment of the disclosure.

The same reference numerals are used to represent the same elementsthroughout the drawings.

DETAILED DESCRIPTION

The following description with reference to the accompanying drawings isprovided to assist in a comprehensive understanding of variousembodiments of the disclosure as defined by the claims and theirequivalents. It includes various specific details to assist in thatunderstanding but these are to be regarded as merely exemplary.Accordingly, those of ordinary skill in the art will recognize thatvarious changes and modifications of the various embodiments describedherein can be made without departing from the scope and spirit of thedisclosure. In addition, descriptions of well-known functions andconstructions may be omitted for clarity and conciseness.

The terms and words used in the following description and claims are notlimited to the bibliographical meanings, but, are merely used by theinventor to enable a clear and consistent understanding of thedisclosure. Accordingly, it should be apparent to those skilled in theart that the following description of various embodiments of thedisclosure is provided for illustration purpose only and not for thepurpose of limiting the disclosure as defined by the appended claims andtheir equivalents.

It is to be understood that the singular forms “a,” “an,” and “the”include plural referents unless the context clearly dictates otherwise.Thus, for example, reference to “a component surface” includes referenceto one or more of such surfaces.

Here, it will be understood that each block in the flowchartillustrations, and combinations of blocks in the flowchartillustrations, can be implemented by computer program instructions.These computer program instructions can be provided to a processor of ageneral-purpose computer, special-purpose computer, or otherprogrammable data processing apparatus to produce a machine, such thatthe instructions, which execute via the processor of the computer orother programmable data processing apparatus, create means forimplementing the functions specified in the flowchart block or blocks.These computer program instructions may also be stored in acomputer-usable or computer-readable memory that can direct a computeror other programmable data processing apparatus to function in aparticular manner such that the instructions stored in thecomputer-usable or computer-readable memory produce an article ofmanufacture including instruction means that implement the functionspecified in the flowchart block or blocks. The computer programinstructions may also be loaded onto a computer or other programmabledata-processing apparatus to cause a series of operations to beperformed on the computer or other programmable data-processingapparatus to produce a computer-implemented process such that theinstructions that execute on the computer or other programmabledata-processing apparatus provide operations for implementing thefunctions specified in the flowchart block or blocks.

Each block of the flowchart illustrations may represent a module,segment, or portion of code, which includes one or more executableinstructions for implementing the specified logical function(s). Itshould also be noted that in some alternative implementations, thefunctions noted in the blocks may occur out of the order shown. Forexample, two blocks shown in succession may in fact be executedsubstantially concurrently or the blocks may sometimes be executed inthe reverse order, depending upon the functionality involved.

As used herein, the term “unit” refers to a software element or ahardware element, such as a field programmable gate array (FPGA) or anapplication specific integrated circuit (ASIC), which performs apredetermined function. However, “unit” does not always have a meaninglimited to software or hardware. The “unit” may be constructed either tobe stored in an addressable storage medium or to be executed on one ormore processors. Therefore, the “unit” includes, for example, softwareelements, object-oriented software elements, class elements or taskelements, processes, functions, properties, procedures, sub-routines,segments of program code, drivers, firmware, micro-codes, circuits,data, database, data structures, tables, arrays, and parameters. Theelements and functions provided by the “unit” may be combined into asmaller number of elements or “units”, or may be divided into a largernumber of elements or “units”. Moreover, the elements and “units” may beimplemented to be reproduced one or more CPUs within a device or asecurity multimedia card.

Hereinafter, the embodiments will be described with reference to theaccompanying drawings. In describing the disclosure below, a detaileddescription of related known configurations or functions incorporatedherein will be omitted if it is determined that the detailed descriptionthereof would unnecessarily obscure the subject matter of thedisclosure. The terms used below are terms defined based on thefunctions in the disclosure, and may differ according to a user oroperator's intentions or customs. Therefore, the definitions of theterms should be made based on the content throughout the specification.

Further, in describing embodiments, the disclosure will be directed toan orthogonal frequency division multiplexing (OFDM)-based wirelesscommunication system, particularly the 3rd generation partnershipproject (3GPP) Evolved universal mobile telecommunications system (UMTS)Terrestrial Radio Access (EUTRA) standard, but it will be understood bythose skilled in the art that the main gist of the disclosure may alsobe applied to other communication systems having similar technicalbackgrounds and channel formats, with slight modification, withoutsubstantially departing from the scope of the disclosure.

Meanwhile, research on the coexistence of the new 5^(th) generation (5G)communication (or new radio (NR) communication in the disclosure) andthe existing long term evolution (LTE) communication in the samespectrum is underway in the mobile communication system.

The disclosure relates to a wireless communication system, and moreparticularly, to a method and an apparatus for transmitting or receivingdata to or from each communication system by a terminal, whereindifferent wireless communication systems coexist in one carrierfrequency or a plurality of carrier frequencies and data transmission orreception can be performed in at least one communication system amongdifferent communication systems.

Generally, a mobile communication system has been developed to providevoice service while ensuring a user's mobility. However, the mobilecommunication system is gradually expanding from voice to include dataservice, and has now developed to the extent of providing high-speeddata service. However, mobile communication systems currently providingservice simultaneously face a lack of resources and user demand forhigher-speed services, and therefore a more advanced mobilecommunication system is required.

As a system under development in the next generation mobilecommunication system in response to this demand, development of a LTEstandard is underway in the 3GPP. LTE is a technology that implementshigh-speed packet-based communications with transmission rates of up to100 Mbps. To this end, various methods are discussed, for example, amethod for reducing the number of nodes located on a communication pathby simplifying the structure of a network, and a method for makingwireless protocols as closer to a wireless channel as possible.

The LTE system adopts a hybrid automatic repeat request (HARQ) method inwhich corresponding data is retransmitted in a physical layer ifdecoding failure occurs upon an initial transmission. In the HARQmethod, if a receiver fails to correctly decode data, a receivertransmits information indicating decoding failure (negativeacknowledgment: NACK) to a transmitter so as to enable the transmitterto retransmit the corresponding data in the physical layer. The receivercombines the data, retransmitted by the transmitter, with existing data,decoding of which failed, and thereby improving data receptionperformance. In addition, if data decoding is successful, the receivermay transmit information (acknowledgment (ACK)) indicating that decodingis successful to the transmitter so as to enable the transmitter totransmit new data.

FIG. 1 illustrates a basic structure of a time-frequency domain, whichis a radio resource domain in which data or a control channel istransmitted in a downlink of an LTE system according to an embodiment ofthe disclosure.

Referring to FIG. 1, the horizontal axis indicates a time domain, andthe vertical axis indicates a frequency domain. The minimum transmissionunit in the time domain is an OFDM symbol, and N_(symb) OFDM symbols 102may be collected to configure one slot 106, and two slots configure onesubframe 105. The length of the slot is 0.5 ms and the length of thesubframe is 1.0 ms. The radio frame 114 is a time-domain unit configuredby 10 subframes. The minimum transmission unit in the frequency domainis a subcarrier, and the total system transmission bandwidth isconfigured by a total of N_(BW) 104 subcarriers.

The basic unit of the time-frequency domain is a resource element (RE)112, and the RE may be represented by an OFDM symbol index and asubcarrier index. A resource block (RB or physical resource block (PRB))108 is defined by N_(symb) consecutive OFDM symbols 102 in the dimedomain and N_(RB) consecutive subcarriers 110 in the frequency domain.Thus, one RB 108 is configured by N_(symb)×N_(RB) REs 112. In general,the minimum transmission unit of data is the RB unit. In the LTE system,N_(symb) is 7, N_(RB) is 12, and N_(BW) and N_(RB) are generallyproportional to the bandwidth of the system transmission band. The datarate increases in proportion to the number of RBs scheduled to a UE. TheLTE system defines and operates six transmission bandwidths. In the caseof an FDD system in which the downlink and the uplink are classified byfrequency, the downlink transmission bandwidth and the uplinktransmission bandwidth may be different from each other. The channelbandwidth represents the RF bandwidth, corresponding to the systemtransmission bandwidth. Table 1 shows the correspondence between systemtransmission bandwidth and channel bandwidth defined in the LTE system.For example, an LTE system having a 10 MHz channel bandwidth includes atransmission bandwidth of 50 RBs.

TABLE 1 Channel bandwidth BW_(channel) [MHz] 1.4 3 5 10 15 20Transmission 6 15 25 50 75 100 bandwidth configuration

Downlink control information is transmitted within the first N OFDMsymbols in the subframe. In general, N={1, 2, 3}. Therefore, the valueof N varies according to each subframe according to the amount ofcontrol information to be transmitted in the current subframe. Thecontrol information includes a control channel transmission intervalindicator, indicating the number of OFDM symbols via which controlinformation is transmitted, scheduling information for downlink data oruplink data, and an HARQ ACK/NACK signal.

In the LTE system, scheduling information for downlink data or uplinkdata is transmitted from a base station to a UE through downlink controlinformation (DCI). An uplink (UL) refers to a radio link through which aUE transmits data or control signals to a base station, and a downlink(DL) refers to a radio link through which a base station transmits dataor control signals to a terminal. The DCI is defined in various formats,and a DCI format may be determined and applied for operation based onwhether scheduling information is for uplink data (UL grant) or fordownlink data (DL grant), whether the DCI is compact DCI having a smallamount of control information, whether or not spatial multiplexing usingmultiple antennas is applied, whether the DCI is DCI for power control,and the like. For example, DCI format 1, corresponding to schedulingcontrol information about downlink data (DL grant), may be configured toinclude at least the following pieces of control information.

-   -   Resource allocation type 0/1 flag: indicates whether the        resource allocation method is type 0 or type 1. Type 0 allocates        resources in units of resource block group (RBG) by applying a        bitmap method. In the LTE system, the basic unit of scheduling        is a resource block (RB), represented by time- and        frequency-domain resources, and the RBG is configured as a        plurality of RBs and serves as a basic unit of scheduling in the        type 0 method. Type 1 allows a specific RB to be allocated        within the RBG.    -   Resource block assignment: indicates the RB allocated to data        transmission. The resources to be represented are determined        according to the system bandwidth and the resource allocation        method.    -   Modulation and coding method (MCS): indicates the modulation        method used for data transmission and the size of the transport        block, which is the data to be transmitted.    -   HARQ process number: indicates the HARQ process number.    -   New data indicator: indicates HARQ initial transmission or        retransmission.    -   Redundancy version: indicates the redundancy version of HARQ.    -   Transmit power control (TCP) command for physical uplink control        channel (PUCCH): indicates a transmission power control command        for a PUCCH, which is an uplink control channel.

The DCI is transmitted through a PDCCH or an enhanced PDCCH (EPDCCH)through a channel coding and modulation process.

Generally, the DCI is independently channel-coded for each UE, and isthen configured and transmitted as an independent PDCCH. The PDCCH ismapped and transmitted during the control channel transmission intervalin the time domain. The location of the frequency domain to which thePDCCH is mapped is determined by the identifier (ID) of each UE and ispropagated to (distributed over) the entire system transmission band.

Downlink data is transmitted through a physical downlink shared channel(PDSCH), which is a physical channel for downlink data transmission. ThePDSCH is transmitted after the control channel transmission interval.The scheduling information, such as the specific mapping location andmodulation method in the frequency domain is indicated by DCItransmitted through the PDCCH.

Via an MCS, which is configured by 5 bits of the control informationincluded in the DCI, the base station notifies the UE of the modulationmethod applied to the PDSCH and the size of data to be transmitted(transport block size (TBS). The TBS corresponds to the size beforechannel coding for error correction is applied to data (transport block,TB) to be transmitted by the base station.

The modulation methods supported by the LTE system are quadraturephase-shift keying (QPSK), 16 quadrature amplitude modulation (QAM) and64QAM, the modulation orders (Q_(m)) of which correspond to 2, 4, and 6,respectively. For example, in the case of QPSK modulation, 2 bits aretransmitted per symbol. In the case of 16 QAM modulation, 4 bits aretransmitted per symbol. In the case of 64 QAM modulation, 6 bits aretransmitted per symbol.

Unlike LTE Rel-8, 3GPP LTE Rel-10 adopted a bandwidth extensiontechnology in order to support transmission of a larger amount of data.Technology called bandwidth extension or carrier aggregation (CA) mayexpand the band and thus increase the amount of data transmissionthrough the expanded band compared to an LTE Rel-8 terminal whichtransmits data in one band. Each of the bands is called a componentcarrier (CC), and the LTE Rel-8 terminal is defined to have onecomponent carrier for each of the downlink and the uplink. Further, agroup of uplink component carriers connected to downlink componentcarriers through SIB-2 is called a cell. An SIB-2 connectionrelationship between the downlink component carriers and the uplinkcomponent carriers is transmitted through a system signal or ahigher-layer signal. The terminal supporting CA may receive downlinkdata through a plurality of serving cells and transmit uplink data.

In LTE Rel-10, if a base station has difficulty transmitting a physicaldownlink control channel (PDCCH) to a specific UE in a specific servingcell, the base station may transmit a PDCCH in another serving cell andconfigure a carrier indicator field (CIF) as a field indicating that thecorresponding PDCCH is a physical downlink shared channel (PDSCH) or aphysical uplink shared channel (PUSCH) of the another serving cell. TheCIF may be configured in the terminal supporting CA. The CIF may bedetermined to indicate another serving cell by adding 3 bits to thePDCCH information in a specific serving cell, and the CIF is includedonly in the case where a higher-layer signal is configured to performcross-carrier scheduling. If a higher-layer signal is not configured toperform cross-carrier scheduling but is configured to performself-scheduling, the CIF is not included, in which case cross-carrierscheduling is not performed. If the CIF is included in the downlinkassignment information (DL assignment), the CIF is defined to indicate aserving cell to which a PDSCH to be scheduled by the DL assignment istransmitted. If the CIF is included in the uplink resource allocationinformation (UL grant), the CIF is defined to indicate the serving cellto which the PUSCH scheduled by the UL grant is transmitted.

As described above, in LTE Rel-10, carrier aggregation (CA), which is abandwidth expansion technology, is defined, and thus a plurality ofserving cells may be configured in the UE. The UE periodically oraperiodically transmits channel information about a plurality of servingcells to the base station in order to perform data scheduling of thebase station. The base station schedules and transmits data for eachcarrier, and the terminal transmits A/N feedback of data transmitted foreach carrier. LTE Rel-10 is designed to transmit a maximum of 21 bits ofA/N feedback and if transmission of A/N feedback and transmission ofchannel information overlap in one subframe, LTE Rel-10 is designed totransmit the A/N feedback and discard the channel information. LTERel-11 is designed to multiplex A/N feedback and channel information ofone cell and transmit A/N feedback corresponding to the maximum of 22bits and the channel information of one cell in transmission resourcesof PUCCH format 3 via PUCCH format 3.

In LTE Rel-13, a maximum of 32 serving-cell configuration scenarios areassumed. LTE-Rel 13 conceptually includes expanding the number ofserving cells up to a maximum of 32 serving cells not only through alicensed band but also through an unlicensed band. Further, LTE Rel-13includes provision of LTE service in an unlicensed band, such as a bandof 5 GHz, based on limitation of the number of licensed bands, such asthe LTE frequency, which is called licensed assisted access (LAA). LAAapplies a carrier aggregation technology of LTE to support operation ofthe LTE cell, corresponding to the licensed cell, as a primary cell(PCell) and the LAA cell, corresponding to the unlicensed band, as asecondary cell (SCell). Accordingly, as in LTE, feedback generated inthe LAA cell corresponding to the SCell should be transmitted only inthe PCell, and the LAA cell may freely apply a downlink subframe and anuplink subframe. Unless specially mentioned in this specification, LTErefers to all technologies evolved from LTE, such as LTE-A and LAA.

In general, a TDD communication system uses a common frequency for thedownlink and the uplink, but separates transmission and reception of theuplink signal and the downlink signal in the time domain. In LTE TDD,uplink or downlink signals are divided and transmitted for eachsubframe. Subframes for uplink and downlink may be divided equally inthe time domain according to the traffic load of the uplink and downlinkand operated, more subframes may be allocated to the downlink andoperated, or more subframes may be allocated to the uplink and operated.In LTE, the length of the subframe is 1 ms, and 10 subframes aregathered to form one radio frame.

TABLE 2 Uplink- downlink Subframe number configuration 0 1 2 3 4 5 6 7 89 0 D S U U U D S U U U 1 D S U U D D S U U D 2 D S U D D D S U D D 3 DS U U U D D D D D 4 D S U U D D D D D D 5 D S U D D D D D D D 6 D S U UU D S U U D

Table 2 shows a TDD uplink-downlink (UL-DL) configuration defined inLTE. In Table 1, “D” denotes a subframe configured for downlinktransmission, “U” denotes a subframe configured for uplink transmission,and “S” denotes a special subframe configured by a downlink pilot timeslot (DwPTS), a guard period (GP), and an uplink pilot time slot(UpPTS). In the DwPTS, control information can be transmitted to thedownlink, as in a general subframe. If the length of the DwPTS is longenough according to the configuration state of the special subframe,downlink data transmission is also possible. The GP is a period foraccepting transition of a transmission state from the downlink to theuplink, and the length of the GP is determined according to the networkconfiguration and the like. The UpPTS is used for sounding referencesignal (SRS) transmission of a UE, necessary for estimating the uplinkchannel state, or random access channel (RACH) transmission of the UEfor random access.

For example, in TDD UL-DL configuration #6, downlink data and downlinkcontrol information can be transmitted to subframes #0, #5 and #9, anduplink data and uplink control information can be transmitted tosubframes #2, #3, #4, #7, and #8. In subframes #1 and #6, which arespecial subframes, the downlink control information and the downlinkdata can be transmitted according to the case, and the SRS or RACH canbe transmitted to the uplink.

In a TDD system, since the downlink or uplink signal transmission isallowed only during a specific time interval, it is necessary to definea specific timing relationship between related uplink and downlinkphysical channels, such as a control channel for data scheduling, ascheduled data channel, and an HARQ ACK/NACK (or HARQ-ACK) channelcorresponding to a data channel.

First, in the LTE TDD system, the uplink/downlink timing relationshipbetween a physical uplink shared channel (PDSCH), which is a physicalchannel for downlink data transmission, and a corresponding physicaluplink control channel (PUCCH) or physical uplink shared channel(PUSCH), which is a physical channel through which uplink HARQ ACK/NACKis transmitted, is as follows.

If the UE receives the PDSCH transmitted to the subframe (n-k) from abase station, the UE transmits the uplink HARQ ACK/NACK for the PDSCH tothe uplink subframe n. Here, k is an element of the set K, and K is asdefined in Table 3.

TABLE 3 UL-DL Subframe n Configuration 0 1 2 3 4 5 6 7 8 9 0 — — 6 — 4 —— 6 — 4 1 — — 7, 6 4 — — — 7, 6 4 — 2 — — 8, 7, 4, — — — — 8, 7, 4, — —6 6 3 — — 7, 6, 11 6, 5 5, 4 — — — — — 4 — — 12, 8, 7, 6, 5, 4, — — — —— — 11 7 5 — — 13, 12, 9, — — — — — — — 8, 7, 5, 4, 11, 6 6 — — 7 7 5 —— 7 7 —

Table 4 shows the subframe through which a corresponding uplink HARQACK/NACK is transmitted, in the case where a PDSCH is transmitted ineach downlink subframe (D) or a special subframe (S) n in each TDD UL-DLconfiguration, and it is rearranged according to the definition of Table3.

TABLE 4 UL-DL Subframe n Configuration 0 1 2 3 4 5 6 7 8 9 0 D S U U U DS U U U 4 6 4 6 1 D S U U D D S U U D 7 6 4 7 6 4 2 D S U D D D S U D D7 6 4 8 7 6 4 8 3 D S U U U D D D D D 4 11  7 6 6 5 5 4 D S U U D D D DD D 12  11  8 7 7 6 5 4 5 D S U D D D D D D D 12  11  9 8 7 6 5 4 13  6D S U U U D S U U D 7 7 7 7 5

FIG. 2 illustrates an operation of a subframe in a TDD frame accordingto an embodiment of the disclosure.

Referring to FIG. 2, Table 4 shown above is described with reference toFIG. 2 below. Here, FIG. 2 exemplarily illustrates the subframe throughwhich a corresponding uplink HARQ ACK/NACK is transmitted, according tothe definition of Table 4, in the case where a PDSCH is transmitted toeach downlink subframe or a special subframe in each TDD UL-DLconfiguration #6 of Table 4.

For example, the uplink HARQ ACK/NACK corresponding to a PDSCH 201,which is transmitted to subframe #0 of radio frame i by a base station,is transmitted to subframe #7 of radio frame i by a UE (indicated byreference numeral 203). At this time, downlink control information (DCI)including scheduling information for the PDSCH 201 is transmittedthrough a PDCCH to the same subframe as the subframe to which the PDSCHis transmitted. As another example, the uplink HARQ ACK/NACKcorresponding to PDSCH 205, which is transmitted by the base station insubframe #9 of radio frame i, is transmitted by the UE in subframe #4 ofradio frame i+1 (indicated by reference numeral 207). Similarly,downlink control information (DCI) including scheduling information forthe PDSCH 205 is transmitted through the PDCCH to the same subframe asthe subframe to which the PDSCH is transmitted.

In the LTE system, downlink HARQ adopts an asynchronous HARQ method inwhich the data retransmission time is not fixed. For example, if NACKfeedback with respect to HARQ data initially transmitted by the basestation is provided from the UE, the base station freely determines thetransmission time for the next HARQ data retransmission attempt througha scheduling operation. The UE buffers HARQ data, which is determined tobe an error as a result of decoding the received data for the HARQoperation, and then combines the HARQ data with subsequentlyretransmitted HARQ data. At this time, in order to maintain thereception buffer capacity of the UE within a predetermined limit, themaximum number of downlink HARQ processes for each TDD UL-DLconfiguration is defined as shown in Table 5. One HARQ process is mappedto one subframe in the time domain.

TABLE 5 TDD UL/DL configuration Maximum number of HARQ processes 0 4 1 72 10 3 9 4 12 5 15 6 6

Referring to FIG. 2, the UE decodes the PDSCH 201 transmitted tosubframe #0 of radio frame i by the base station, and if it isdetermined to be an error, the UE transmits NACK to subframe #7 of radioframe i (indicated by reference numeral 203). Upon receiving the NACK,the base station configures the retransmission data for the PDSCH 201 asthe PDSCH 209 and transmits the PDSCH together with the PDCCH. FIG. 2exemplifies the case where the retransmission data is transmitted tosubframe #1 of radio frame i+1 by considering that the maximum number ofdownlink HARQ processes of TDD UL-DL configuration #6 is 6 according tothe definition of Table 5. For example, there are a total of 6 downlinkHARQ processes 211, 212, 213, 214, 215, and 216 between the initialtransmission PDSCH 201 and the retransmission PDSCH 209.

Unlike the downlink HARQ in the LTE system, the uplink HARQ adopts asynchronous HARQ method having a fixed data transmission time point. Forexample, the uplink/downlink timing relationship between a physicaluplink shared channel (PUSCH), which is a physical channel for uplinkdata transmission, and a physical hybrid indicator channel (PHICH),which is a physical channel through which a downlink HARQ ACK/NACKcorresponding to the PUSCH is transmitted, is fixed by the followingrules.

When the UE receives the PDCCH including the uplink scheduling controlinformation transmitted to the subframe n by the base station or thePHICH through which the downlink HARQ ACK/NACK is transmitted, the UEtransmits uplink data corresponding to the control information to thesubframe (n+k) through PUSCH. Here, k is as defined in Table 6.

TABLE 6 TDD UL/DL DL subframe number n Configuration 0 1 2 3 4 5 6 7 8 90 4 6 4 6 1 6 4 6 4 2 4 4 3 4 4 4 4 4 4 5 4 6 7 7 7 7 5

Further, if the UE receives PHICH transferring the downlink HARQACK/NACK to the subframe i from the base station, the PHICH correspondsto the PUSCH, which is transmitted to a subframe (i−k) by the UE. Here,k is as defined in Table 7.

TABLE 7 TDD UL/DL DL subframe number i Configuration 0 1 2 3 4 5 6 7 8 90 7 4 7 4 1 4 6 4 6 2 6 6 3 6 6 6 4 6 6 5 6 6 6 4 7 4 6

FIG. 3 illustrates an operation of a subframe in a TDD frame accordingto an embodiment of the disclosure.

Referring to FIG. 3, in the case of TDD UL-DL configuration #1, if aPDCCH or a PHICH is transmitted to each downlink or special subframe,the subframe to which the corresponding PUSCH is transmitted, and thesubframe to which a PHICH corresponding to the PUSCH is transmitted areillustrated according to the definitions of Table 6 and Table 7.

For example, the uplink PUSCH corresponding to the PDCCH or PHICH 301,which is transmitted to subframe #1 of radio frame i by the basestation, is transmitted from subframe #7 of radio frame i by the UE(indicated by reference numeral 303). In addition, the base stationtransmits the PHICH or PDCCH corresponding to the PUSCH to the UE insubframe #1 of radio frame i+1 (indicated by reference numeral 305). Asanother example, an uplink PUSCH corresponding to the PDCCH or PHICH 307transmitted to subframe #6 of radio frame i by the base station istransmitted to subframe #2 of radio frame i+1 by the UE (indicated byreference numeral 309). In addition, the base station transmits thePHICH or PDCCH corresponding to the PUSCH to the UE in subframe #6 ofradio frame i+1 (indicated by reference numeral 311).

In the LTE TDD system, the downlink transmission of the PDCCH or thePHICH corresponding to the PUSCH is limited in the specific downlinksubframe in relation to the PUSCH transmission, thereby guaranteeing theminimum transmission/reception processing time of the base station andthe UE. For example, in the case of TDD UL-DL configuration #1 of FIG.3, in subframes #0 and #5, the PDCCH for scheduling the PUSCH or thePHICH corresponding to the PUSCH is not transmitted to downlink.

On the other hand, as a post-LTE communication system, a 5th-generationwireless cellular communication system (hereinafter, referred to as “5G”or “NR” in the specification) should be capable of freely satisfying thevarious requirements of users and service providers, so that servicesthat meet various requirements may be supported.

Accordingly, 5G may define various 5G services, such as enhanced mobilebroadband communication (hereinafter, referred to as eMBB in thisspecification), massive machine-type communication (hereinafter,referred to as mMTC in this specification), and ultra-reliable andlow-latency communications (hereinafter, referred to as URLLC in thisspecification) as technology for satisfying requirements selected for 5Gservices, among requirements of a maximum UE transmission rate of 20Gbps, a maximum UE speed of 500 km/h, a maximum delay time of 0.5 ms,and a UE access density of 1,000,000 UEs/km².

For example, in order to provide eMBB in 5G, a maximum downlink UEtransmission rate of 20 Gbps and a maximum uplink UE transmission rateof 10 Gbps should be provided from the viewpoint of one base station. Inaddition, the average transmission rate that the UE actually experiencesneeds to be increased. In order to satisfy these requirements,improvement of transmission/reception technologies, including furtherimproved multi-input multi-output transmission technology, is needed.

In addition, in order to support application services, such as those ofthe IoT, mMTC is under consideration in 5G. The mMTC needs to meetrequirements of supporting access by massive numbers of terminals withina cell, improving coverage of the UE, increasing effective batterylifetime, and reducing the cost of the UE in order to efficientlysupport IoT services. The IoT is attached to various sensors and devicesto provide a communication function, and thus needs to support a largenumber of UEs within the cell (for example, 1,000,000 UEs/km²). Further,in the mMTC, the UE is highly likely to be located in a shade area, suchas the basement of a building or an area that cannot be covered by thecell due to characteristics of the service, and thus mMTC requires widercoverage than the coverage provided by eMBB. The mMTC is highly likelyto be configured as a cheap UE, and it is difficult to frequently changea battery of such a UE, so a long battery life time is needed.

Finally, the URLLC is cellular-based wireless communication used for aparticular purpose and corresponds to a service used for remote controlof a robot or a machine device, industrial automation, unmanned aerialvehicles, remote health control, and emergency notification, and thusneeds to provide ultra-low-latency and ultra-reliable communication. Forexample, the URLLC should have a maximum delay time shorter than 0.5 msand is also required to provide a packet error rate equal to or lowerthan 10⁻⁵. Therefore, for the URLLC, a transmission time interval (TTI)smaller than that of a 5G service, such as eMBB should be provided, andadditionally, design for allocation of wide resources in a frequencyband is required.

The services under consideration in the 5th-generation wireless cellularcommunication system should be provided as a single framework. Forexample, in order to efficiently manage and control resources, it ispreferable to perform control and transmission such that the servicesare integrated into one system rather than to independently operate theservices.

FIG. 4 illustrates an operation in which services under consideration in5G are transmitted to one system according to an embodiment of thedisclosure.

Referring to FIG. 4, the frequency-time resources 401 used by 5G mayinclude a frequency axis 402 and a time axis 403. FIG. 4 illustrates anexample in which eMBB 405, mMTC 406, and URLLC 407 are operated withinone framework. Further, as a service that can be additionally consideredin 5G, an enhanced mobile broadcast/multicast service (eMBMS) 408 forproviding a cellular-based broadcast service may be considered. Theservices under consideration for 5G, such as the eMBB 405, the mMTC 406,the URLLC 407, and the eMBMS 408, may be multiplexed throughtime-division multiplexing (TDM) or frequency-division multiplexing(FDM) within one system frequency bandwidth operated in 5G, andspatial-division multiplexing may also be considered. In the case of theeMBB 405, it is preferable to occupy and transmit on as large afrequency bandwidth as possible for a particular time in order toprovide the increased data transmission rate which has been described inthe above. Accordingly, it is preferable that the service of the eMBB405 be time-division-multiplexed with another service within the systemtransmission bandwidth 401 and transmitted, but it is also preferablethat the service of the eMBB be frequency-division-multiplexed (FDM)with other services within the system transmission bandwidth andtransmitted according to the need of the other services.

Unlike other services, the mMTC 406 requires an increased transmissioninterval in order to secure wider coverage, and may secure the coverageby repeatedly transmitting the same packet within the transmissioninterval. In addition, in order to reduce the terminal complexity andprice, the transmission bandwidth within which the terminal can performreception is limited. In the case of considering the requirementsdescribed above, it is preferable that the mMTC 406 befrequency-division multiplexed (FDM) with other services within thetransmission system bandwidth 401 of 5G.

It is preferable that the URLLC 407 have a shorter transmission timeinterval (TTI) compared to other services in order to meet theultra-low-latency requirement of the service. In addition, in order tomeet the ultra-reliable requirement, a low coding rate is needed, so itis preferable to have a wide bandwidth from the aspect of frequency.Upon considering the requirements of the URLLC 407, it is preferablethat the URLLC 407 be time-division multiplexed with other serviceswithin the transmission system bandwidth 401 of 5G.

The aforementioned services may have different transmission or receptionmethods and transmission or reception parameters in order to meet therequirements of the services. For example, the respective services mayhave different numerologies depending on the requirements thereof. Thenumerology includes a cyclic prefix (CP) length, subcarrier spacing, anOFDM symbol length, and a transmission time interval (TTI) in anorthogonal frequency-division multiplexing (OFDM) or an orthogonalfrequency division multiple access (OFDMA)-based communication system.As an example in which the services have different numerologies, theeMBMS 408 may have a longer CP than other services. Since the eMBMStransmits higher traffic based on broadcasting, the same data may betransmitted in all cells.

Here, if the signals, received by a plurality of cells, are the same asor shorter than the CP length, the UE may receive and decode all of thesignals and thus obtain a single frequency network (SFN) diversity gain,and accordingly, even a UE located at a cell boundary can receivebroadcasting information without any coverage restriction. However, inthe case where the CP length is relatively longer than other services,in order to support the eMBMS in 5G, waste occurs due to CP overhead,and thus a longer OFDM symbol is required than in the case of otherservices, which results in narrower subcarrier spacing compared to otherservices.

Further, as an example in which different numerologies are used forservices in 5G, in the case of URLLC, a shorter OFDM symbol may berequired as a shorter TTI is required compared to other services, andmoreover, wider subcarrier spacing may be required.

On the other hand, one TTI may be defined as one slot and configured by14 OFDM symbols or 7 OFDM symbols in 5G. Accordingly, in the case ofsubcarrier spacing of 15 kHz, one slot has a length of 1 ms or 0.5 ms.In 5G, one TTI may be defined as one mini-slot or sub-slot for emergencytransmission and transmission in an unlicensed band, and one mini-slotmay have OFDM symbols ranging from 1 to (the total number of OFDMsymbols of the slot)−1. If the length of one slot corresponds to 14 OFDMsymbols, the length of the mini-slot may be determined as one of 1 to 13OFDM symbols. The length, format, or repetition form of the slot or themini-slot may be defined according to a standard, or may be transmittedby a higher-layer signal, system information, or a physical signal, andreceived by the UE. In addition, instead of a mini-slot or sub-slot, thelength of the slot may be determined as one of 1 to 14 OFDM symbols, andthe length of the slot may be transmitted through a higher-layer signalor system information and received by the terminal.

The slot or the mini-slot may be defined to have various transmissionformats, and may be classified into the following formats.

-   -   DL-only slot or full-DL slot: the DL-only slot includes only a        downlink period and supports only downlink transmission.    -   DL-centric slot: the DL-centric slot includes a downlink period,        a GP (or flexible symbol), and an uplink period, wherein the        number of OFDM symbols in the downlink period is larger than the        number of OFDM symbols in the uplink period.    -   UL-centric slot: the UL-centric slot includes a downlink period,        a GP (or flexible symbol), and an uplink period, wherein the        number of OFDM symbols in the downlink period is smaller than        the number of OFDM symbols in the uplink period.    -   UL-only slot or full-UL slot: the UL-only slot includes only an        uplink period and supports only uplink transmission.

In the above, only the slot formats have been classified, but themini-slot may also be classified through the same classification method.For example, the mini-slot may be classified into a DL-only mini-slot, aDL-centric mini-slot, a UL-centric mini-slot, and a UL-only mini-slot.In the above, the flexible symbol may be used as a guard symbol fortransmission or reception switching, and may also be used for thepurpose of channel estimation.

Hereinafter, although the following detailed description of theembodiments will be directed to LTE and 5G, it can be understood bythose skilled in the art that the main gist of the disclosure may alsobe applied to other communication systems having similar technicalbackgrounds and channel formats, with slight modification, withoutsubstantially departing from the scope of the disclosure.

In order to stably support the mobility of the terminal of the existingmobile communication system while satisfying the requirements of theultra-high speed data service and the ultra-low-latency service of theabove-mentioned 5G system, it is necessary to configure an integratedsystem that combines a beamforming technology operating in theultra-high frequency band, a new radio access technology (New RAT)applying a short TTI, and an LTE/LTE-A system operating in arelatively-low frequency band. In this case, the new radio accesstechnology serves to satisfy the requirements of the 5G system, and theLTE/LTE-A system serves to stably support the mobility of the terminal

FIG. 5 illustrates a configuration of a communication system to whichthe disclosure is applied according to an embodiment of the disclosure.

Referring to FIG. 5, an example of a configuration of an integratedsystem obtained by combining a base station, which is associated withthe new radio access technology, with an LTE/LTE-A base station isillustrated.

Referring to FIG. 5, small base stations 503, 505, and 507 havingrelatively small coverage areas 504, 506, and 508 may be disposed in thecoverage area 502 of a macro base station 501. In general, the macrobase station 501 may transmit signals with relatively highertransmission power than that of the small base stations 503, 505, and507, so that the coverage area 502 of the macro base station 501 isrelatively larger than the coverage areas 504, 506, and 508 of the smallbase stations 503, 505, and 507. In the example of FIG. 5, the macrobase station indicates an LTE/LTE-A system operating in a relatively lowfrequency band, and the small base stations 503, 505, and 507 indicate asystem applying a new radio access technology (NR or 5G) operating in arelatively high frequency band.

The macro base station 501 and the small base stations 503, 505, and 507are interconnected, and a certain degree of backhaul delay may existtherebetween depending on the connection state. Therefore, it may not bedesirable to exchange information, which is sensitive to transmissiondelay, between the macro base station 501 and the small base stations503, 505, and 507.

Meanwhile, FIG. 5 exemplarily illustrates carrier aggregation betweenthe macro base station 501 and the small base stations 503, 505, and507, but the disclosure is not limited thereto and may be applicable tocarrier aggregation between base stations located at differentgeographical locations. For example, according to an embodiment of thedisclosure, the disclosure is also applicable to carrier aggregationbetween macro base stations located at different locations, or tocarrier aggregation between small base stations located at differentlocations. In addition, the number of aggregated carriers is notlimited. Alternatively, the disclosure is also applicable to carrieraggregation in the macro base station 501 and carrier aggregation in thesmall base stations 503, 505, and 507.

Referring to FIG. 5, the macro base station 501 may use frequency f1 fordownlink signal transmission, and the small base stations 503, 505, and507 may use frequency f2 for downlink signal transmission. At this time,the macro base station 501 may transmit data or control information to apredetermined UE 509 through frequency f1, and the small base stations503, 505, and 507 may transmit data or control information throughfrequency f2. Through the carrier aggregation described above, a basestation that implements a new radio access technology capable ofsupporting an ultra-wide band in a high frequency band, may provideultra-high-speed data service and ultra-low delay service, and a basestation that implements LTE/LTE-A technology in a relativelylow-frequency band may support stable mobility of a UE.

Meanwhile, the configuration illustrated in FIG. 5 is applicable notonly to downlink carrier aggregation but also to uplink carrieraggregation. For example, the UE 509 may transmit data or controlinformation to the macro base station 501 through frequency f1′ foruplink signal transmission. In addition, the UE 509 may transmit data orcontrol information to the small base stations 503, 505, and 507 throughfrequency f2′ for uplink signal transmission. The f1′ may correspond tof1, and the f2′ may correspond to f2. The uplink signal transmission, bythe UE, to the macro base station and the small base station may beperformed at different time points, or may be performed simultaneously.In either case, due to the physical limitations of the power amplifierelement of the UE and radio wave regulation pertaining to the UEtransmission power, the total sum of uplink transmission power of the UEat a certain instant needs to be maintained within a predeterminedthreshold.

In the environment illustrated in FIG. 5, the operation of the UE 509,which accesses the macro base station 501 and the small base stations503, 505, and 507 to perform communication, is referred to as dualconnectivity (DC). If the UE performs dual connectivity, the followingtwo configuration methods are possible.

First, a UE performs an initial connection to the macro base station 501operating as an LTE/LTE-A system, and then receives, via a higher-layersignal (system or RRC signal), configuration information for datatransmission and reception to or from the macro base station.Thereafter, the UE receives, from a higher-layer signal (system or RRCsignal) of the macro base station 501, configuration information fordata transmission and reception to or from the small base stations 503,504, and 505 operating as an NR system, and performs random access tothe small base stations 503, 504, and 505) so that the UE enters a dualconnectivity state in which data transmission and reception is possibleto or from the macro base station 501 and the small base station 503,504, and 505. At this time, the macro base station 501 operating as anLTE/LTE-A system is referred to as a master cell group (MCG), and thesmall base stations 503, 504, and 505, operating as an NR system, arereferred to as a secondary cell group (SCG). The state where the UE isin the dual connectivity state may be exemplified by the case where theUE is configured as an MCG using E-UTRA radio access (or LTE/LTE-A) andan SCG using NR radio access. Alternatively, it may be exemplified bythe case where the UE is configured for E-UTRA NR dual connectivity(EN-DC).

Second, the UE performs initial connection to the small base stations503, 504, and 505 operating as an NR system, and then receives, from ahigher-layer signal (system or RRC signal), configuration informationfor data transmission and reception to or from the small base stations.Thereafter, the UE receives, from a higher-layer signal (system or RRCsignal) of the small base station 503, 504, and 505, configurationinformation for data transmission and reception to or from the macrobase station 501 operating as an LTE/LTE-A system, and performs randomaccess to the macro base station 501 so that the UE enters a dualconnectivity state in which data transmission and reception is possibleto or from the small base station 503, 504, and 505 and the macro basestation 501. At this time, the small base stations 503, 504, and 505operating as an NR system are referred to as an MCG, and the macro basestation 501 operating as an LTE system is referred to as an SCG. Thestate where the UE is in the dual connectivity state may be exemplifiedby the case where the UE is configured as an MCG using NR radio accessand an SCG using E-UTRA radio access (or LTE/LTE-A). Alternatively, itmay be exemplified by the case where the UE is configured for NR E-UTRAdual connectivity (NE-DC).

Hereinafter, embodiments described in the disclosure will be proposedbased on the first dual connectivity configuration method and the seconddual connectivity configuration method. For example, the disclosureproposes another embodiment according to whether LTE cells using E-UTRAcorrespond to an MCG or whether NR cells using NR correspond to an MCG.If the UE is in a dual connectivity state, since importance is given touplink transmission to the MCG rather than to uplink transmission to theSCG, another embodiment is proposed according to whether the LTE cellsusing E-UTRA are the MCG or whether the NR cell using NR are the MCG. Inaddition, since timing for performing uplink transmission to a cellusing NR, for example, PDCCH-to-PUSCH transmission timing orPDCCH-to-PUCCH transmission timing, may be indicated differently by ahigher-layer signal configuration and an instruction from the PDCCH, andtiming for performing uplink transmission to a cell using LTE (e.g.,PDCCH-to-PUSCH transmission timing or PDCCH-to-PUCCH transmissiontiming) is fixed, embodiments are to be proposed based on theseconditions.

In the case where the UE is configured for E-UTRA NR dual connectivity(EN-DC), the power distribution method will be described first. Forexample, in the case where the UE is configured to be an MCG usingE-UTRA radio access and is configured to an SCG using NR radio access,the UE receives, from the LTE base station or the NR base station, theconfiguration for the maximum power value of the uplink for LTE and themaximum power value of the uplink for NR. In addition, the UE receivesthe configuration for the maximum power value for the EN-DC operationfrom the LTE base station or the NR base station. In this case, if thesum of the maximum power value of the uplink for LTE and the maximumpower value of the uplink for NR is greater than the maximum power valuefor the EN-DC operation, the UE applies one of the following two powerdistribution methods.

First, proposed is semi-static power sharing between the MCG (LTE) andthe SCG (NR). In the case where the UE receives a reference TDDconfiguration that restricts LTE uplink transmission only in a specificsubframe in order to perform uplink transmission of LTE, if the UE doesnot provide an indication of or report the ability to perform dynamicpower sharing to a base station, the UE does not expect uplinktransmission in a slot of the NR that coincides with the time intervalin which LTE uplink transmission is performed in an uplink subframe,according to the reference TDD configuration (or the UE does not expectconfiguration or scheduling indicating NR uplink transmission from an NRbase station).

Second, proposed is dynamic power sharing between the MCG (LTE) and theSCG (NR). If the UE provides an indication of or reports the ability toperform dynamic power sharing to the base station, and if LTE uplinktransmission and NR uplink transmission of the UE collide and the sum ofthe power of the LTE uplink transmission and power of the NR uplinktransmission is greater than the maximum power value for the EN-DCoperation, the UE reduces the NR uplink transmission power so that thesum of the power of the LTE uplink transmission and the power of the NRuplink transmission is smaller than the maximum power value for theEN-DC operation. In the case of reducing the NR uplink transmissionpower, if the transmission power to be reduced is greater than X, the UEmay drop NR transmission. If the transmission power to be reduced isless than X, the UE performs NR uplink transmission using the reducedtransmission power.

FIG. 6 illustrates a proper NR uplink transmission and an LTE uplinktransmission according to an embodiment of the disclosure.

Referring to FIG. 6, LTE 601 is an MCG and is operated in a TDD mode,and NR 602 is an SCG. Therefore, FIG. 6 may be applied if a UE isconfigured for EN-DC. In FIG. 6, the TDD cell of LTE 601 corresponds toTDD UL-DL configuration #6 (FIG. 6 describes the TDD UL-DL configuration#6 situation by way of example, but without limitation), and the EN-DCUE may receive TDD UL-DL configuration #6 from the system informationand may identify the locations of an uplink subframe, a specialsubframe, and a downlink subframe. Information about the locations ornumbers of uplink, downlink, or flexible slots of the NR 602 and theOFDM symbol thereof may be received, by the EN-DC UE, from systeminformation, higher-level information, or a physical-layer signal.

FIG. 6 will be described based on the situation in which the EN-DC UEoperates in a semi-static power distribution mode between the LTE 601and the NR 602. For example, FIG. 6 is based on a situation where theEN-DC UE receives a configuration for reference TDD configuration #5among reference TDD configurations (#2, #4, #5) capable of limiting LTEuplink transmission only in a specific subframe in order to performuplink transmission of LTE, and the EN-DC UE does not provide anindication of or report the ability to perform dynamic powerdistribution to the LTE or NR base station. At this time, the EN-DC UEmay identify that LTE uplink transmission is possible only in uplinksubframe #2, which matches the uplink subframe according to referenceTDD configuration #5 among uplink subframes #2, #3, #4, #7, and #8 ofTDD UL-DL configuration #6 of LTE 601, received via system information(indicated by reference numerals 604 and 607), and that NR uplinktransmission is possible in a slot of NR that matches the time intervalof the remaining uplink subframes #3, #4, #7, and #8 (indicated byreference numerals 603, 605, 606, and 608) (see Table 3 and Table 4).

If the EN-DC UE follows a UL HARQ timing relationship between PDCCHtransmission and PUSCH transmission (see Table 6 and Table 7), definedin TDD UL-DL configuration #6, and TDD UL-DL configuration given fromsystem information of LTE 601 with respect to uplink data transmission,the EN-DC UE performs PUSCH transmission in uplink subframe #2 byscheduling the PDCCH received from the LTE base station in downlinksubframe #5 of the LTE 601 (indicated by reference numeral 611),ACK/NACK for the PUSCH or PDCCH is received from the LTE base station inspecial subframe #6 (indicated by reference numeral 612), and inresponse thereto the retransmitted PUSCH is transmitted in uplinksubframe #3 (indicated by reference numeral 613). Since the timeinterval corresponding to the uplink subframe #3 is an interval in whichonly NR uplink transmission is possible, if the PUSCH retransmission ofthe EN-DC UE occurs, an issue of collision of the NR uplink transmissionand the LTE uplink transmission occurs. Therefore, the disclosureprovides a method for addressing the above issues through Embodiments 1and 2.

Next, in connection with FIG. 6, another issue of concern will bedescribed based on the situation in which the EN-DC UE operates in adynamic power distribution mode between LTE 601 and NR 602. For example,if the EN-DC UE provides an indication of or reports the ability toperform the dynamic power distribution to the base station, with respectto the case where, in a time interval of uplink subframe #2, which islimited to perform uplink transmission of LTE according to the referenceTDD configuration, the LTE uplink transmission and the NR uplinktransmission of the UE collide, as indicated by reference numeral 608 ofFIG. 6, or the sum of the power of the LTE uplink transmission and thepower of the NR uplink transmission is greater than the maximum powervalue for the EN-DC operation, the EN-DC UE provides a method foraddressing the issue through Embodiment 3. In addition, in uplinksubframes #3, #4, #7, and #8, which are time intervals other than uplinksubframe #2, limited to perform uplink transmission of LTE according tothe reference TDD configuration, if the LTE uplink transmission and NRuplink transmission of the UE collide, as indicated by reference numeral608 of FIG. 6, or if the sum of the power of the LTE uplink transmissionand the power of the NR uplink transmission is greater than the maximumpower value for the EN-DC operation, the EN-DC UE provides a method foraddressing the above issue through Embodiment 4.

Embodiment 1

FIG. 7 illustrates an uplink transmission according to an embodiment ofthe disclosure.

Referring to FIG. 7, LTE 701 is an MCG and is operated in a TDD mode,and NR 702 is an SCG. Therefore, FIG. 7 may be applied if the UE isconfigured for EN-DC. In FIG. 7, the TDD cell of LTE 701 corresponds toTDD UL-DL configuration #1, and the EN-DC UE receives TDD UL-DLconfiguration #1 from system information, so as to identify thelocations of an uplink subframe, a special subframe, and a downlinksubframe. Information about the locations or the numbers of the uplink,downlink, or flexible slots of the NR 702 and OFDM symbols thereof maybe received by the EN-DC UE from system information, higher-levelinformation or a physical-layer signal. FIG. 7 is based on a situationwhere the EN-DC UE is operating in a semi-static power distribution modebetween LTE 701 and NR 702. For example, the situation may be assumed inwhich the EN-DC UE receives configuration for reference TDDconfiguration #2 among reference TDD configurations (#2, #4, #5) capableof limiting LTE uplink transmission only in a specific subframe in orderto perform uplink transmission of LTE, and the EN-DC UE does not providean indication of or report the ability to perform dynamic powerdistribution to the LTE or NR base station. At this time, the EN-DC UEmay identify that LTE uplink transmission is possible only in uplinksubframes #2 and #7, which match the uplink subframe according toreference TDD configuration #2, among uplink subframes #2, #3, #7, and#8 of TDD UL-DL configuration #1 of LTE 701, received via systeminformation, and that NR uplink transmission is possible in a slot of NRthat matches the time interval of the remaining uplink subframes #3 and#8 (see Table 3 and Table 4).

As described above, if the TDD UL-DL configuration, received from theLTE base station of LTE 701, is one of TDD UL-DL configurations #1, #2,#3, #4, and #5 other than TDD UL-DL configurations #0 and #6, and if thereference TDD configuration, which is received via a higher-layer signalfrom the LTE base station or the NR base station, is one of #2, #4, and#5, the embodiment proposes that the EN-DC UE follows a UL HARQ timingrelationship between PDCCH transmission and PUSCH transmission, definedin TDD UL-DL configuration #1 in FIG. 7, and TDD UL-DL configurationgiven from system information of LTE 701 with respect to uplink datatransmission (see Table 6 and Table 7). In this case, since the EN-DC UEreceives uplink subframes according to PDCCH reception, PUSCHtransmission, and PUSCH retransmission, in which the uplink subframesare generated in the same LTE uplink subframe for every radio frame(indicated by reference numerals 711, 712, 713, and 714), if PUSCHretransmission of the EN-DC UE occurs, the NR uplink transmission andthe LTE uplink transmission collision may not occur.

Embodiment 2

FIG. 8 illustrates an uplink transmission according to an embodiment ofthe disclosure.

Referring to FIG. 8, LTE 801 is an MCG and is operated in a TDD mode,and NR 802 is an SCG. Therefore, FIG. 8 may be applied if the UE isconfigured for EN-DC. In FIG. 8, the TDD cell of LTE 801 corresponds toTDD UL-DL configuration #6, and the EN-DC terminal may receive TDD UL-DLconfiguration #6 from system information so as to identify the locationsof an uplink subframe, a special subframe, and a downlink sub-frame.Information about the locations or numbers of uplink, downlink, orflexible slots of the NR 802 and OFDM symbols thereof may be received,by the EN-DC UE, from system information, higher-level information, or aphysical-layer signal. FIG. 8 considers the situation in which the EN-DCUE operates in a semi-static power distribution mode between LTE 801 andNR 802. For example, FIG. 8 is based on a situation where the EN-DC UEreceives reference TDD configuration #4, among reference TDDconfigurations #2, #4, and #5 capable of limiting the LTE uplinktransmission only to a specific subframe in order to perform uplinktransmission of LTE, and the EN-DC UE does not provide an indication ofor report the ability to perform dynamic power distribution to the LTEor NR base station. At this time, the EN-DC UE may identify that LTEuplink transmission is possible only in uplink subframes #2 and #3,which match an uplink subframe according to reference TDD configuration#4, among uplink subframes #2, #3, #4, #7, and #8 of TDD UL-DLconfiguration #6 of LTE 801, received via system information, and thatNR uplink transmission is possible in a slot of NR that matches the timeintervals of the remaining uplink subframes #4, #7, and #8 (see Table 3and Table 4).

As described above, if the TDD UL-DL configuration received from the LTEbase station of LTE 801 is one of TDD UL-DL configurations #0 and #6,and the reference TDD configuration, received via a higher-layer signalfrom the LTE base station or the NR base station, is one ofconfigurations #2, #4, and #5, the embodiment proposes that the EN-DC UEfollows the UL HARQ timing relationship between PDCCH transmission andPUSCH transmission, defined according to another specific secondreference TDD configuration rather than the TDD UL-DL configurationgiven from the system information of LTE 801 with respect to uplink datatransmission (see Table 6 and Table 7). In this case, since the EN-DC UEreceives uplink subframes according to PDCCH reception, PUSCHtransmission, and PUSCH retransmission, in which the uplink subframesare generated in the same LTE uplink subframe for every radio frame(indicated by reference numerals 811, 812, 813, and 814), if the PUSCHretransmission of the EN-DC UE occurs, the NR uplink transmission andthe LTE uplink transmission collision may not occur.

The second reference TDD configuration for defining the UL HARQ timingrelationship may be proposed as follows.

If the UL-DL configuration from the system information corresponds to #6and the reference TDD configuration is one of #2, #4, and #5, the secondreference TDD configuration for UL HARQ timing corresponds to #1.

If the UL-DL configuration from system information corresponds to #0 andthe reference TDD configuration is one of #2 and #5, the secondreference TDD configuration for UL HARQ timing corresponds to #1.

If the UL-DL configuration from the system information corresponds to #0and the reference TDD configuration corresponds to #4, if secondreference TDD configuration #1 for UL HARQ timing is followed, the PDCCHfor scheduling the PUSCH of uplink subframe #3 needs to be transmittedin downlink subframe #9 of a previous radio frame. However, in UL-DLconfiguration #0, since subframe #9 is an uplink subframe, an issue inwhich the PDCCH cannot be transmitted occurs.

Therefore, if the UL-DL configuration from the system informationcorresponds to #0 and the reference TDD configuration corresponds to #4,the following proposal is possible.

First, the second reference TDD configuration for UL HARQ timingcorresponds to #1, but the EN-DC UE does not expect scheduling of thePUSCH in UL subframe #3 of LTE.

Second, the second reference TDD configuration for UL HARQ timing in ULsubframe #2 corresponds to #1, but the EN-DC UE expects that the PDCCHfor scheduling the PUSCH in UL subframe #3 is transmitted from downlinksubframe #5 of the previous radio frame.

Third, if the UL-DL configuration from the system informationcorresponds to #0, the EN-DC UE does not expect that the reference TDDconfiguration corresponds to #4. For example, the UE expects only thecase where the reference TDD configuration is configured to be #2 or #5.

Unlike the above proposals, it is also possible for the EN-DC UE not toexpect the UL-DL configuration from system information to be #0 or #6from the beginning. For example, the EN-DC UE does not expect the sameconfiguration as in the second embodiment of the disclosure, andreceives only one of TDD UL-DL configurations #1, #2, #3, #4, #5 fromthe system information. The reference TDD configuration may receive oneof #2, #4, and #5 from a higher-layer signal, and the second referenceTDD configuration for UL HARQ timing may be defined in the specificationas #1.

Embodiment 3

In FIG. 6, if the EN-DC UE provides an indication of or reports theability to perform the dynamic power distribution to the base stationbased on the situation in which the EN-DC UE operates in a dynamic powerdistribution mode between LTE 601 and NR 602, the disclosure provides amethod in which the EN-DC UE address the issue through Embodiment 3 withrespect to the case where, in a time interval of the uplink subframe #2,which is limited to perform uplink transmission of LTE according to thereference TDD configuration, the LTE uplink transmission and the NRuplink transmission of the UE collide as indicated by reference numeral608 in FIG. 6, or the sum of the power of the LTE uplink transmissionand the power of the NR uplink transmission is greater than the maximumpower value for the EN-DC operation according to an embodiment of thedisclosure.

According to a first method, the EN-DC UE performs only LTE uplinktransmission and always drops NR uplink transmission. As describedabove, it is possible to protect the uplink transmission of LTE servingas the MCG and maintain the connection with the MCG, and to transmit orreceive important information necessary for RRC connection to or fromthe MCG.

According to a second method, the EN-DC UE maintains the power of LTEuplink transmission, and reduces the power of NR uplink transmission sothat the sum of the power of LTE uplink transmission and the power of NRuplink transmission is equal to or smaller than the maximum power valuefor the configured EN-DC operation. By protecting the uplinktransmission of LTE serving as the MCG according to the method describedabove, it is possible to maintain the connection with the MCG, transmitor receive important information necessary for RRC connection to or fromthe MCG, and simultaneously perform NR uplink transmission within themaximum power of EN-DC.

Embodiment 4

Referring to FIG. 6, if the EN-DC UE provides an indication of orreports the ability to perform the dynamic power distribution to thebase station based on the situation in which the EN-DC UE operates in adynamic power distribution mode between LTE 601 and NR 602, thedisclosure provides a method in which the EN-DC UE addresses the issuethrough Embodiment 4 with respect to the case where, in uplink subframes#3, #4, #7, and #8 other than uplink subframe #2, which is limited toperform uplink transmission of LTE according to the reference TDDconfiguration, the LTE uplink transmission and the NR uplinktransmission of the UE collide as indicated by reference numeral 608 ofFIG. 6, or the sum of the power of the LTE uplink transmission and thepower of the NR uplink transmission is greater than the maximum powervalue for the EN-DC operation.

According to a first method, the EN-DC UE performs only LTE uplinktransmission and always drops NR uplink transmission. As describedabove, in an uplink subframe corresponding to a time interval other thanuplink subframe #2, which is limited to perform uplink transmission ofLTE according to the reference TDD configuration, it is possible toprotect the uplink transmission of LTE, serving as the MCG, and maintainthe connection with the MCG, and to transmit or receive importantinformation necessary for RRC connection to or from the MCG.

According to a second method, the EN-DC UE maintains the power of LTEuplink transmission and reduces the power of NR uplink transmission sothat the sum of the power of LTE uplink transmission and the power of NRuplink transmission is equal to or smaller than the maximum power valuefor the configured EN-DC operation. According to the method describedabove, the uplink transmission of the LTE serving as the MCG isprotected even in the uplink subframe corresponding to a time intervalother than uplink subframe #2, which is limited to uplink transmissionof the LTE according to the reference TDD configuration in the abovemethod, and it is possible to maintain the connection with the MCG,transmit or receive important information necessary for RRC connectionto or from the MCG, and simultaneously perform NR uplink transmissionwithin EN-DC maximum power, so as to increase the datatransmission/reception throughput of the UE.

According to a third method, the EN-DC UE performs only NR uplinktransmission and always drops LTE uplink transmission. According to themethod, in the uplink subframes corresponding to the time interval otherthan the uplink subframe #2, which is limited to uplink transmission ofLTE according to the reference TDD configuration, the uplinktransmission of the NR serving as the SCG is possible rather than theuplink transmission of the LTE serving as the MCG, so that the amount ofdata transmission/reception using NR can be increased, and thus the datatransmission/reception throughput of the EN-DC UE can be increased.

According to another method, it is possible to combine the above threemethods and apply the resultant combination to the EN-DC UE. Forexample, it is possible to apply the first method to specific LTE uplinkchannel transmission or to a specific LTE uplink transmission signal,such as in the case where the LTE uplink transmission corresponds to animportant uplink transmission for RRC connection, such as physicalrandom access channel (PRACH) transmission. If the LTE uplinktransmission does not correspond to the specific LTE uplink transmissionor the specific LTE uplink transmission signal, it is possible to applya second or third method thereto. Alternatively, a third method isapplied to a specific NR uplink channel transmission or a specific NRuplink transmission signal, such as in the case where the NR uplinktransmission is an important uplink transmission, such as PRACHtransmission, and if the NR uplink transmission does not correspond tothe specific NR uplink transmission or a specific NR uplink transmissionsignal, it is possible to apply the first or second method thereto.

FIG. 9A illustrates a base station procedure, and FIG. 9B illustrates aUE procedure according to various embodiments of the disclosure.

First, a base station procedure will be described.

Referring to FIGS. 9A and 9B, in operation 911, a base station transmitsconfiguration information of respective cells to a UE through systeminformation or a higher-layer signal. The configuration information maybe cell-related information of MCG or SCG cells required for dualconnectivity (at least one of TDD or FDD information, uplink anddownlink carrier frequencies, uplink and downlink frequency bands, anduplink and downlink subcarrier spacing), and may be configurationinformation required for data transmission and reception in the MCG orSCG. Alternatively, the configuration information may include at leastone of configuration information related to various parameters describedin the embodiments. The base station may be an NR base station using NRradio access or an E-UTRA base station using E-UTRA radio access.

In operation 912, the base station configures uplink transmission forthe UE according to embodiments proposed in the disclosure, andtransmits scheduling information indicating uplink transmission. Thebase station may be an NR base station using NR radio access or anE-UTRA base station using E-UTRA radio access. The uplink transmissionconfiguration may refer to uplink transmission, which is not indicatedby the PDCCH but is configured in a higher-layer signal configuration,such as periodic channel information transmission, and the uplinktransmission indicated by the scheduling information may denote uplinktransmission, which is indicated by the PDCCH and transmitted from theUE, such as PUSCH transmission or HARQ-ACK transmission, Alternatively,the uplink transmission may be uplink transmission from a UE, such asPRACH or SRS.

In operation 913, the base station receives uplink transmission from theUE according to the embodiments proposed in the disclosure. The basestation may be an NR base station using NR radio access or an E-UTRAbase station using E-UTRA radio access.

Next, the UE procedure will be described.

In operation 921, the UE receives configuration information ofrespective cells from the base station through system information or ahigher-layer signal. The configuration information may be cell-relatedinformation of MCG or SCG cells required for dual connectivity (at leastone of TDD or FDD information, uplink and downlink carrier frequencies,uplink and downlink frequency bands, and uplink and downlink subcarrierspacing), and may be configuration information required for datatransmission or reception in the MCG or SCG. Alternatively, theconfiguration information may include at least one of configurationinformation related to various parameters described in the embodiments.As described in the embodiments of the disclosure, before receiving thedynamic power-sharing capability via a higher-layer signal from the basestation, the UE may transmit the capability-related information to thebase station. The base station may be an NR base station using NR radioaccess or an E-UTRA base station using E-UTRA radio access.

In operation 922, the UE receives uplink transmission configurationinformation from the base station according to embodiments proposed inthe disclosure, and receives scheduling information indicating uplinktransmission. The base station may be an NR base station using NR radioaccess or an E-UTRA base station using E-UTRA radio access. The uplinktransmission configuration information may denote configurationinformation related to uplink transmission, which is not indicated bythe PDCCH but is configured in a higher-layer signal configuration, suchas periodic channel information transmission, and the uplinktransmission indicated by the scheduling information may denote uplinktransmission, which is indicated by the PDCCH and transmitted from theUE, such as PUSCH transmission or HARQ-ACK transmission. Alternatively,the uplink transmission may be uplink transmission transmitted from aUE, such as PRACH or SRS.

In operation 923, the UE controls transmission timing and transmissionpower using the UL HARQ timing relationship (PDCCH-to-PUSCHtransmission, PUSCH-to-PDCCH transmission, or the like) according to theembodiments proposed in the disclosure, and transmits the uplinktransmission to the base station. The controlling of the transmissionpower may include an operation of dropping uplink transmission orreducing uplink transmission power as described in the embodiments. Thebase station may be an NR base station using NR radio access or anE-UTRA base station using E-UTRA radio access.

FIG. 10 illustrates addressing an issue of concern where the EN-DC UEtransmits or receives data to or from base stations described in FIG. 5through a cell having a certain configuration according to an embodimentof the disclosure.

FIG. 10 is based on a situation where LTE cells correspond to an MCG,and may be configured for an EN-DC UE through carrier aggregation (CA)of two cells or a case where only one cell is configured for the EN-DCUE without carrier aggregation, for only a primary cell (PCell) asdescribed below. FIG. 10 is based on a situation where NR cellscorrespond to an SCG and are configured for the EN-DC UE using one cell1002 according to an embodiment of the disclosure. The disclosure isdescribed under the assumption that a PCell 1001, which is the first LTEcell of MCG, is operated as a TDD cell and corresponds to TDD UL-DLconfiguration #0, and that a secondary cell (S Cell) 1003, which is thesecond LTE cell of the MCG, is operated as an FDD cell. In FIG. 10, theSCell 1003 is an FDD cell, but may be operated according to TDD UL-DLconfiguration #0, such as a TDD cell, especially the PCell 1001, or theSCell may be operated according to another TDD UL-DL configuration inthe disclosure. For example, the TDD configuration or the FDDconfiguration of the SCell 1003 is not limited to the configurationillustrated in FIG. 10, and other configurations may be applied in thesame manner.

Referring to FIG. 10, the EN-DC UE may receive TDD UL-DL configuration#0 of the PCell 1001 from system information, so as to identify thelocations of an uplink subframe, a special subframe, and a downlinksubframe, and may receive TDD UL-DL configuration #0 of the PCell 1001from a higher-layer signal so as to identify carrier information andbandwidth information of the SCell 1003. Information about the locationsor numbers of uplink, downlink, or flexible slots of the NR cell 1002and OFDM symbols thereof may be received, by the EN-DC UE, from systeminformation, higher-level information, or a physical-layer signal. FIG.10 considers a situation where the EN-DC UE operates in a semi-staticpower distribution mode between LTE and NR. For example, FIG. 10 isbased on a situation where the EN-DC UE receives reference TDDconfigurations #2 via a higher-layer signal, among reference TDDconfigurations #2, #4, and #5 capable of limiting LTE uplinktransmission only in a specific subframe in order to perform uplinktransmission of LTE, or where the EN-DC UE does not provide anindication of or report the ability to perform dynamic power sharing tothe LTE or NR base station. At this time, the EN-DC UE may identify thatLTE uplink transmission is possible only in uplink subframes #2 and #7,which match uplink subframe according to reference TDD configuration #2,among uplink subframes #2, #3, #4, #7, #8, and #9 of TDD UL-DLconfiguration #0 of the PCell 1001, received via system information, andthat NR uplink transmission is possible in a slot of NR that matches thetime intervals of the remaining uplink subframes #3, #4, #8, and #9.Accordingly, the EN-DC UE may transmit HARQ ACK/NACK for downlink datatransmitted from the PCell 1001, based on the timing relationship inUL-DL configuration #2 of Table 3 and Table 4, corresponding toreference TDD configuration value #2. For example, if downlink data isreceived from subframes #4, #5, #8, and #6 of the PCell 1001, the EN-DCUE transmits HARQ ACK/NACK feedback for the downlink data in subframe #2of the PCell 1001 (indicated by reference numeral 1011), and if downlinkdata is received from subframes #9, #0, #3, and #1, the EN-DC UEtransmits HARQ ACK/NACK feedback for downlink data in subframe #7 of thePCell 1001 (indicated by reference numeral 1012).

Since HARQ ACK/NACK for the downlink data reception of the LTE SCell1003 needs to be transmitted from the PCell 1001, which is a primarycell, the HARQ ACK/NACK transmission is also possible only in a specificLTE subframe of the PCell 1001. For example, the EN-DC UE may identifythat LTE uplink transmission is possible only in uplink subframes #2 and#7, which match the uplink subframe according to reference TDDconfiguration #2, and that NR uplink transmission is only possible in aslot of the NR that matches the time intervals of the remaining uplinksubframes #3, #4, #8, and #9.

Accordingly, HARQ ACK/NACK for downlink data transmitted from the LTESCell 1003 is transmitted based on the timing relationship in the DLreference UL-DL configuration #2 of Table 8, corresponding to referenceTDD configuration value #2. For example, if downlink data is receivedfrom subframes #4, #5, #6, #7, and #8 of the LTE SCell 1003, the EN-DCUE transmits HARQ ACK/NACK feedback for the downlink data in subframe #2of the PCell 1001 (indicated by reference numeral 1013), and if downlinkdata is received from subframes #9, #0, #1, #2, and #3 of the LTE SCell1003, the EN-DC UE transmits HARQ ACK/NACK feedback for the downlinkdata in subframe #7 of the PCell 1001 (indicated by reference numeral1014).

Referring to Table 8, which is similar to Table 3, if the UE receivesfrom the base station a PDSCH transmitted to a subframe (n-k) of the FDDSCell, the UE transmits uplink HARQ ACK/NACK for the PDSCH to the uplinksubframe n of the TDD PCell. At this time, “k” is an element of a set K,and K is as defined in Table 8. K is called a bundling window, anddenotes a set of multiple downlink subframes in which PDCCH/EPDCCH orPDSCHs corresponding to transmission of HARQ ACK/NACK in one uplinksubframe are transmitted.

TABLE 8 DL-reference UL/DL Subframe n Configuration 0 1 2 3 4 5 6 7 8 90 — — 6, 5 5, 4 4 — — 6, 5 5, 4 4 1 — — 7, 6 6, 5, 4 — — — 7, 6 6, 5, 4— 2 — — 8, 7, 6, — — — — 8, 7, 6, — — 5, 4 5, 4 3 — — 11, 10, 9, 6, 5 5,4 — — — — — 8, 7, 6 4 — — 12, 11, 10, 7, 6, 5, — — — — — — 9, 8, 7 4 5 —— 13, 12, 11, — — — — — — — 10, 9, 8, 7, 6, 5, 4 6 — — 8, 7 7, 6 6, 5 —— 7 7, 6, 5 —

At this time, at the time of transmitting HARQ ACK/NACK feedback insubframe #2 of the PCell 1001, the EN-DC UE may transmit HARQ ACK/NACKfeedback using PUCCH format 1a/1b, PUCCH 1b with channel selection, orPUCCH format 3/4/5, which are defined in the LTE standard. Which PUCCHformat is to be used to, among the PUCCH formats, to transmit HARQACK/NACK feedback may be configured in advance for the EN-DC UE, througha higher-layer signal from a base station. Further, for a specificsituation (for example, in the case of receiving a single PDSCH in aPCell 1001, scheduled by a PDCCH/EPDCCH in which a “DAI” fieldcorresponds to 1, a single PDCCH indicating a DL SPS release in which a“DAI” field corresponds to 1, or a single PDSCH in the PCell 1001 inwhich the PDCCH/EPDCCH does not exist), the LTE standard may be arrangedsuch that one of the PUCCH formats is to be used based on adetermination by the UE. The higher-layer signal may include informationon a PUCCH format that the EN-DC UE needs to use at the time oftransmitting HARQ-ACK feedback and information on at least one resourceor multiple resources for transmitting the PUCCH format, and the EN-DCUE may receive the higher-layer signal and thus transmit a PUCCH formatincluding HARQ-ACK feedback via a specific resource.

The method for selecting, by the EN-DC UE, one resource from amongresources for transmitting the PUCCH format is as follows. The EN-DC UEhaving received multiple PDCCHs/EPDCCHs through multiple subframes ofthe PCell 1001 or the LTE SCell 1003 may use the 2-bit value of“transmit power control (TPC) command” field of the PDCCH/EPDCCH toindicate one resource from among 4 resources if a “downlink assignmentindex (DAI)” field from the PDCCH/EPDCCH is greater than 1 or if thePDCCH/EPDCCH in which the “DAI” field is 1 is not the first PDCCH/EPDCCHin the set K (see Table 3 or Table 8). The UE having received oneresource from the “TPC command” field transmits HARQ ACK/NACK feedbackto the PUCCH format configured using the resource. At this time, if the“DAI” field is 1 or the PDCCH/EPDCCH in which the “DAI” field is 1 isthe first PDCCH/EPDCCH in the set K (see Table 3 or Table 8), the 2-bitvalue of the “transmit power control (TPC) command” field of thePDCCH/EPDCCH may indicate a power adjustment value at the time oftransmitting the configured PUCCH format. The EN-DC UE adjusts andtransmits the power of the PUCCH format from the “TPC command” field.

Here, if the EN-DC UE receives only the PDSCH through one firstPDCCH/EPDCCH in the PCell 1001 or only one PDCCH/EPDCCH for DL SPSrelease (indicated by reference numeral 1011 or 1012), or receives onlyone PDSCH in which the corresponding PDCCH is absent, or if the basestation transmits PDCCH/EPDCCH for scheduling multiple PDSCHs inmultiple subframes but the EN-DC UE receives only PDSCH through onefirst PDCCH/EPDCCH due to a reception error, the “TPC command” field inthe received PDCCH/EPDCCH is a field for power control at the time oftransmitting a PUCCH format, and thus the EN-DC UE cannot know whichresource among the plurality of configured PUCCH transmission resourcesshould be used to transmit the PUCCH format. Accordingly, the disclosureprovides a method for determining PUCCH transmission resources of aPUCCH format in the situation described above.

According to a first method, the base station may separately configurethe PUCCH transmission resource of a PUCCH format for the EN-DC UEthrough a higher-layer signal in the situation described above. Inaddition to a plurality of resources (which are resources mapped to theTPC command field) for transmitting the PUCCH format described above,additional PUCCH resources may be configured to be used to address theissue described above. At this time, the PUCCH resource may be aresource for PUCCH format 3/4/5 or a resource for PUCCH format 1a/1b.Accordingly, if the UE determines that the PUCCH resource corresponds toa resource for PUCCH format 3/4/5 transmission or if the same is definedin a standard, the UE may transmit the PUCCH format 3/4/5 through thePUCCH resource. If the UE determines that the PUCCH resource correspondsto a resource for PUCCH format 1a/1b transmission or if the same isdefined in the standard, the UE may transmit the PUCCH format 1a/1bthrough the PUCCH resource.

For example, different PUCCH resources may be configured with respect tothe case where a single PDSCH in a PCell, scheduled by a PDCCH/EPDCCH inwhich a “DAI” field is 1, is received (case 1), the case where a singlePDCCH indicating a DL SPS release in which a “DAI” field of 1 isreceived (case 2), and the case where a single PDSCH is received in aPCell in which the PDCCH/EPDCCH is absent (case 3), or a single PUCCHresource may be configured to be used for the above cases. In the abovecases (that is, case 1, case 2, and case 3), if different PUCCHresources are configured and two or more cases occur within one bundlingwindow (K), the UE may perform PUCCH format transmission using a PUCCHformat 1b with channel selection. At this time, the PUCCH resource fortransmission of the PUCCH format 1b with channel selection is configuredby a resource configured for case 1, a resource configured for case 2,and a resource configured for case 3, and which resource is to be usedis determined according to the transmitted HARQ-ACK information, and theUE may transmit PUCCH format 1b on the determined resource.

At this time, the characteristics of the resource for case 3 may be asfollows. If only an LTE cell without an NR cell, i.e., without an SCG,is configured for the EN-DC UE, the EN-DC UE may receive, from ahigher-layer signal, a preconfigured PUCCH resource for use in the casewhere a single PDSCH is received in a PCell from which a PDCCH/EPDCCH isabsent, and may use the resource to perform PUCCH format transmission incase 3.

In the above cases (that is, case 1, case 2, and case 3), the UE mayperform PUCCH format transmission using PUCCH format 3/4/5 if one PUCCHresource is configured to be a higher-layer signal and two or more casesoccur within one bundling window (K).

The EN-DC UE receives the resource via a higher-layer signal, andtransmits a PUCCH format including HARQ-ACK feedback through a resourceconfigured via the higher-layer signal in the issue situation describedabove. Alternatively, the EN-DC UE may configure the PUCCH resource tobe used for the issue situation within the plurality of resources (whichare resources mapped to the TPC command field). For example, if thereare four pre-configured resources (which are resources mapped to the TPCcommand field), one of the four resources may be configured, via ahigher-layer signal, to be used in the issue described above, and thehigher-layer signal may be included in information for configuring theplurality of resources and be transmitted as separate information. TheUE transmits PUCCH format 3/4/5 via the PUCCH resource, and thistransmission method enables the UE to transmit PUCCH format 3/4/5without additional PUCCH resource configuration.

According to a second method, the base station may use the “TPC command”field in the first PDCCH/EPDCCH to indicate the PUCCH transmissionresource of PUCCH format 3/4/5 to the EN-DC UE in the situationdescribed above. Therefore, the “TPC command” field is used to adjustthe power at the time of transmitting the PUCCH format, by the EN-DC UE,and is also used to determine resources for PUCCH format transmission.For example, the EN-DC UE transmits PUCCH format by adjusting poweraccording to the value of the “TPC command” field in the resourceindicated according to the value of the “TPC command” field in the firstPDCCH/EPDCCH.

According to a third method, in the situation described above, the EN-DCUE transmits the PUCCH format by using, by default, one resource among aplurality of resources (which are resources mapped to the TPC commandfield) for transmitting the PUCCH format 3/4/5 described above. Forexample, among the plurality of resources, a resource to be used in theissue described above is defined in a standard, and the EN-DC UEtransmits PUCCH format 3/4/5 including HARQ-ACK feedback via thepredefined resource. For example, the standard may be arranged such thatif the TPC command field is 2 bits, the first resource corresponding to“00” among “00”, “01”, “10”, and “11” is to be used. Alternatively, thestandard may be arranged such that which resource among four resourcesshould be used is determined based on an equation including one or morepieces of information, such as a downlink subframe index in which aPDCCH/EPDCCH is received, an uplink subframe index in which a PUCCH istransmitted, and a UE unique identifier.

According to a fourth method, in the issue described above, the EN-DC UEincludes the HARQ ACK/NACK feedback in the PUCCH format 1a/1b, insteadof using PUCCH format 3/4/5, and transmits the same. At this time, atransmission resource of the PUCCH format 1a/1b may be implicitly mappedto the transmission resource of the PDCCH/EPDCCH, received in the issuedescribed above. In order to prevent PUCCH transmission resourcecollision with an existing LTE UE, the base station may transmit anoffset value to be added to the PUCCH transmission resource to the EN-DCUE through a higher-layer signal. The EN-DC UE may determine atransmission resource based on the implicitly mapped PUCCH transmissionresource and the offset value. For example, the EN-DC UE having receivedthe offset value determines the transmission resource of the PUCCHformat 1a/1b by adding the offset value to the PUCCH transmissionresource, which has been implicitly mapped to the received transmissionresource of PDCCH/EPDCCH. Then, the EN-DC UE may transmit the PUCCHformat 1a/1b via the determined transmission resource.

According to a fifth method, if the PUCCH resource is configured for theUE via a higher-layer signal, that is, if the UE receives theconfiguration of the PUCCH resource via a higher-layer signal inaddition to a resource mapped to a TPC command field, in order toaddress the issue described above, the UE may transmit a PUCCH format onthe configured PUCCH transmission resource via the higher-layer signal.Therefore, as described according to the first method, the UE receivesthe higher-layer signal from a base station and transmits thecorresponding PUCCH format on the PUCCH resource according thereto. If,as described according to the first method, the PUCCH resource foraddressing the issue described above is not separately configured forthe UE, whether to transmit the PUCCH format using a certain resourceamong the preconfigured PUCCH resources, that is, among resources mappedto the TPC command field, is defined in the standard as describedaccording to the third method, and the UE may determine the PUCCHresource by the defined method and transmit the PUCCH format. Therefore,in this case, as described according to the third method, the UEtransmits a corresponding PUCCH format using the PUCCH resource definedin the standard if there is no higher-layer signal from the base stationor if corresponding information is absent in the higher-layer signal.

According to the fifth method described above, if the base stationdetermines that PDCCH reception by the UE is not stable, it is possibleto perform PUCCH transmission on the resource by additionallyconfiguring the PUCCH transmission resource through the higher-layersignal. If it is determined that the PDCCH reception by the UE isstable, it is possible to use the resource to perform data transmissionwithout additionally configuring the PUCCH transmission resource throughthe higher-layer signal.

FIG. 11 illustrates a base station according to an embodiment of thedisclosure.

Referring to FIG. 11, a controller 1101 may configure requiredinformation according to the base station procedure according to FIG. 9Aof the disclosure and various embodiments of the disclosure, and maycontrol uplink transmission timing and uplink transmission receptionfrom a UE according to various embodiments. The controller 1101 mayperform control so as to transmit control information through an LTE or5G control information transmission device 1105, and may transmit orreceive data to or from a UE through an LTE or 5G datatransmission/reception device 1107. In addition, the controller 1101 mayperform control such that a scheduler 1103 schedules LTE or 5G data andtransmits or receives LTE or 5G data to or from the UE through the LTEor 5G data transmission/reception device 1107. In the above, the basestation device includes the controller 1101, the scheduler 1103, the LTEor 5G control information transmission device 1105, and the LTE or 5Gdata transmission/reception device 1107, but the base station device mayinclude a transceiver and a controller. The controller may control theoperation of the base station according to various embodiments. AlthoughLTE and 5G have been described together for convenience in the basestation, the base station may be an NR base station using NR radioaccess or an E-UTRA base station using E-UTRA radio access.

According to an embodiment of the disclosure the controller isconfigured to transmit, to a terminal via the transceiver, a highersignal including a plurality of PUCCH resource information, to transmit,to the terminal via the transceiver, a PDSCH, and to receive, from theterminal via the transceiver, a HARQ feedback information correspondingto the PDSCH based on a PUCCH format and resource, wherein the PUCCHformat uses a preset format and the resource corresponds to a firstPUCCH resource among the plurality of PUCCH resource information, incase that Evolved UMTS EUTRA NR-EN-DC is set in the terminal, TDD framestructure is set in a primary cell (PCell) of the terminal, a referenceTDD configuration information is set in the terminal, and a DAI fieldvalue of a DCI format corresponding to the PDSCH is set in 1.

According to an embodiment of the disclosure wherein the preset formatis a PUCCH format 3. According to an embodiment of the disclosurewherein the PUCCH format uses the preset format and the resourcecorresponds to the first PUCCH resource among the plurality of PUCCHresource information, in case that the EN-DC is set in the terminal, TDDframe structure is set in the PCell of the terminal, the reference TDDconfiguration information is set in the terminal, and a PDCCHcorresponding to the PDSCH is not detected.

According to an embodiment of the disclosure wherein the reference TDDconfiguration information indicates a reference configuration fortransmitting an LTE uplink signal, and wherein the reference TDDconfiguration information indicates at least one of the TDDconfiguration 2, 4, or 5.

According to an embodiment of the disclosure wherein the controller isfurther configured to transmit a PDCCH indicating a release of adownlink (DL) SPS and to receive new HARQ feedback informationcorresponding to a reception of the PDCCH, wherein the new HARQ feedbackinformation is transmitted based on the preset format and the firstPUCCH resource among the plurality of PUCCH resource information, incase that EN-DC is set in the terminal, TDD frame structure is set inthe PCell of the terminal, the reference TDD configuration informationis set in the terminal, and the DAI field value of the PDCCH is set in1.

FIG. 12 illustrates a UE according to an embodiment of the disclosure.

Referring to FIG. 12, a controller 1201 may receive, from a basestation, required configuration information and scheduling according tothe UE procedure of FIG. 9B of the disclosure and various embodiments ofthe disclosure, and may control uplink transmission timing and uplinktransmission power according to the disclosure so as to perform uplinktransmission configured by the base station or indicated by scheduling.The UE may receive the location of an uplink data channel transmissionresource from the base station through an LTE or 5G control informationreception device 1205 and an LTE or 5G data transmission/receptiondevice 1206 or multiplex uplink control information on an uplink datachannel and transmit the same. The controller 1201 may perform controlsuch that LTE or 5G data, scheduled at the received resource location,is transmitted or received to or from the LTE or a 5G base stationthrough the LTE or 5G data transmission/reception device 1206. In theabove, the UE includes the controller 1201, the LTE or 5G controlinformation reception device 1205, and the LTE or 5G datatransmission/reception device 1206, but the UE may include a transceiverand a controller. The controller may control the operation of the UEaccording to various embodiments. Referring to FIG. 12, LTE and 5G havebeen described together for convenience of explanation. The base stationfor transmitting or receiving the control information and data may be anNR base station using NR radio access or an E-UTRA base station usingE-UTRA radio access.

According to an embodiment of the disclosure wherein the controller isconfigured to receive, via the transceiver, a higher signal including aplurality of PUCCH resource information, to determine a PUCCH format andresource for a HARQ feedback information corresponding to a PDSCH, andto transmit, via the transceiver, the HARQ feedback information based onthe determined PUCCH format and the resource, wherein the PUCCH formatuses a preset format and the resource corresponds to a first PUCCHresource among the plurality of PUCCH resource information, in case thatEUTRA NR-EN-DC is set in the terminal, TDD frame structure is set in aprimary cell (PCell) of the terminal, a reference TDD configurationinformation is set in the terminal, and a DAI field value of a DCIformat corresponding to the PDSCH is set in 1.

According to an embodiment of the disclosure wherein the preset formatis a PUCCH format 3. According to an embodiment of the disclosurewherein the PUCCH format uses the preset format and the resourcecorresponds to the first PUCCH resource among the plurality of PUCCHresource information, in case that the EN-DC is set in the terminal, TDDframe structure is set in the PCell of the terminal, the reference TDDconfiguration information is set in the terminal, and a physicaldownlink control channel (PDCCH) corresponding to the PDSCH is notdetected.

According to an embodiment of the disclosure wherein the reference TDDconfiguration information indicates a reference configuration fortransmitting a LTE uplink signal, and wherein the reference TDDconfiguration information indicates at least one of the TDDconfiguration 2, 4, or 5.

According to an embodiment of the disclosure wherein the controller isfurther configured to receive a PDCCH indicating a release of a DL SPS,and to transmit new HARQ feedback information corresponding to areception of the PDCCH, wherein the new HARQ feedback information istransmitted based on the preset format and the first PUCCH resourceamong the plurality of PUCCH resource information, in case that EN-DC isset in the terminal, TDD frame structure is set in the PCell of theterminal, the reference TDD configuration information is set in theterminal, and the DAI field value of the PDCCH is set in 1.

While the disclosure has been shown and described with reference tovarious embodiments thereof, it will be understood by those skilled inthe art that various changes in form and details may be made thereinwithout departing from the spirit and scope of the disclosure as definedby the appended claims and their equivalents.

What is claimed is:
 1. A method performed by a terminal in a wirelesscommunication system, the method comprising: receiving a higher signalincluding a plurality of physical uplink control channel (PUCCH)resource information; determining a PUCCH format and a resource for ahybrid automatic repeat request (HARQ) feedback informationcorresponding to a physical downlink shared channel (PDSCH); andtransmitting the HARQ feedback information based on the determined PUCCHformat and the resource, wherein the PUCCH format corresponds to apreset format and the resource corresponds to a first PUCCH resourceamong the plurality of PUCCH resource information, in case that theterminal is configured with Evolved universal mobile telecommunicationssystem (UMTS) Terrestrial Radio Access (EUTRA) new radio (NR)-dualconnectivity (EN-DC), a frame structure of a primary cell (PCell) istime division duplex (TDD) frame structure, the terminal is configuredwith a reference TDD configuration information, and a physical downlinkcontrol channel (PDCCH) corresponding to the PDSCH is not detected. 2.The method of claim 1, wherein the preset format is a PUCCH format
 3. 3.The method of claim 1, wherein the PUCCH format corresponds to thepreset format and the resource corresponds to the first PUCCH resourceamong the plurality of PUCCH resource information, in case that theterminal is configured with the EN-DC, the frame structure of the PCellis TDD frame structure, the terminal is configured with the referenceTDD configuration information, and a downlink assignment index (DAI)field value of a downlink control information (DCI) format correspondingto the PDSCH is set in
 1. 4. The method of claim 3, wherein the PUCCHformat corresponds to the preset format and the resource is determinedbased on a transmit power control (TPC) command of the DCI correspondingto the PDSCH, in case that the terminal is configured with the EN-DC,the frame structure of the PCell is TDD frame structure, the terminal isconfigured with the reference TDD configuration information, and the DAIfield value of the DCI format corresponding to the PDSCH is greaterthan
 1. 5. The method of claim 1, wherein the reference TDDconfiguration information indicates a reference configuration fortransmitting a long term evolution (LTE) uplink signal, and wherein thereference TDD configuration information indicates at least one of theTDD configuration 2, 4, or
 5. 6. A method performed by a base station ina wireless communication system, the method comprising: transmitting, toa terminal, a higher signal including a plurality of physical uplinkcontrol channel (PUCCH) resource information; transmitting, to theterminal, a physical downlink shared channel (PDSCH); and receiving,from the terminal, a hybrid automatic repeat request (HARQ) feedbackinformation corresponding to the PDSCH based on a PUCCH format and aresource, wherein the PUCCH format corresponds to a preset format andthe resource corresponds to a first PUCCH resource among the pluralityof PUCCH resource information, in case that the terminal is configuredwith Evolved universal mobile telecommunications system (UMTS)Terrestrial Radio Access (EUTRA) new radio (NR)-dual connectivity(EN-DC), a frame structure of a primary cell (PCell) is time divisionduplex (TDD) frame structure, the terminal is configured with areference TDD configuration information, and a physical downlink controlchannel (PDCCH) corresponding to the PDSCH is not detected.
 7. Themethod of claim 6, wherein the preset format is a PUCCH format
 3. 8. Themethod of claim 6, wherein the PUCCH format corresponds to the presetformat and the resource corresponds to the first PUCCH resource amongthe plurality of PUCCH resource information, in case that the terminalis configured with the EN-DC, the frame structure of the PCell is TDDframe structure, the terminal is configured with the reference TDDconfiguration information, and a downlink assignment index (DAI) fieldvalue of a downlink control information (DCI) format corresponding tothe PDSCH is set in
 1. 9. The method of claim 8, wherein the PUCCHformat corresponds to the preset format and the resource is determinedbased on a transmit power control (TPC) command of the DCI correspondingto the PDSCH, in case that the terminal is configured with the EN-DC,the frame structure of the PCell is TDD frame structure, the terminal isconfigured with the reference TDD configuration information, and the DAIfield value of the DCI format corresponding to the PDSCH is greaterthan
 1. 10. The method of claim 6, wherein the reference TDDconfiguration information indicates a reference configuration fortransmitting a long term evolution (LTE) uplink signal, and wherein thereference TDD configuration information indicates at least one of theTDD configuration 2, 4, or
 5. 11. A terminal in a wireless communicationsystem, the terminal comprising: a transceiver; and a controllerconfigured to: receive, via the transceiver, a higher signal including aplurality of physical uplink control channel (PUCCH) resourceinformation, determine a PUCCH format and a resource for a hybridautomatic repeat request (HARQ) feedback information corresponding to aphysical downlink shared channel (PDSCH), and transmit, via thetransceiver, the HARQ feedback information based on the determined PUCCHformat and the resource, wherein the PUCCH format corresponds to apreset format and the resource corresponds to a first PUCCH resourceamong the plurality of PUCCH resource information, in case that theterminal is configured with Evolved universal mobile telecommunicationssystem (UMTS) Terrestrial Radio Access (EUTRA) new radio (NR)-dualconnectivity (EN-DC), a frame structure of a primary cell (PCell) istime division duplex (TDD) frame structure, the terminal is configuredwith a reference TDD configuration information, and a physical downlinkcontrol channel (PDCCH) corresponding to the PDSCH is not detected. 12.The terminal of claim 11, wherein the preset format is a PUCCH format 3.13. The terminal of claim 11, wherein the PUCCH format corresponds tothe preset format and the resource corresponds to the first PUCCHresource among the plurality of PUCCH resource information, in case thatthe terminal is configured with the EN-DC, the frame structure of thePCell is TDD frame structure, the terminal is configured with thereference TDD configuration information, and a downlink assignment index(DAI) field value of a downlink control information (DCI) formatcorresponding to the PDSCH is set in
 1. 14. The terminal of claim 13,wherein the PUCCH format corresponds to the preset format and theresource is determined based on a transmit power control (TPC) commandof the DCI corresponding to the PDSCH, in case that the terminal isconfigured with the EN-DC, the frame structure of the PCell is TDD framestructure, the terminal is configured with the reference TDDconfiguration information, and the DAI field value of the DCI formatcorresponding to the PDSCH is greater than
 1. 15. The terminal of claim11, wherein the reference TDD configuration information indicates areference configuration for transmitting a long term evolution (LTE)uplink signal, and wherein the reference TDD configuration informationindicates at least one of the TDD configuration 2, 4, or
 5. 16. A basestation in a wireless communication system, the base station comprising:a transceiver; and a controller configured to: transmit, to a terminalvia the transceiver, a higher signal including a plurality of physicaluplink control channel (PUCCH) resource information, transmit, to theterminal via the transceiver, a physical downlink shared channel(PDSCH), and receive, from the terminal via the transceiver, a hybridautomatic repeat request (HARQ) feedback information corresponding tothe PDSCH based on a PUCCH format and a resource, wherein the PUCCHformat corresponds to a preset format and the resource corresponds to afirst PUCCH resource among the plurality of PUCCH resource information,in case that the terminal is configured with Evolved universal mobiletelecommunications system (UMTS) Terrestrial Radio Access (EUTRA) newradio (NR)-dual connectivity (EN-DC), a frame structure of a primarycell (PCell) is time division duplex (TDD) frame structure, the terminalis configured with a reference TDD configuration information, and aphysical downlink control channel (PDCCH) corresponding to the PDSCH isnot detected.
 17. The base station of claim 16, wherein the presetformat is a PUCCH format
 3. 18. The base station of claim 16, whereinthe PUCCH format corresponds to the preset format and the resourcecorresponds to the first PUCCH resource among the plurality of PUCCHresource information, in case that the terminal is configured with theEN-DC, the frame structure of the PCell is TDD frame structure, theterminal is configured with the reference TDD configuration information,and a downlink assignment index (DAI) field value of a downlink controlinformation (DCI) format corresponding to the PDSCH is set in
 1. 19. Thebase station of claim 16, wherein the PUCCH format corresponds to thepreset format and the resource is determined based on a transmit powercontrol (TPC) command of the DCI corresponding to the PDSCH, in casethat the terminal is configured with the EN-DC, the frame structure ofthe PCell is TDD frame structure, the terminal is configured with thereference TDD configuration information, and the DAI field value of theDCI format corresponding to the PDSCH is greater than
 1. 20. The basestation of claim 16, wherein the reference TDD configuration informationindicates a reference configuration for transmitting a long termevolution (LTE) uplink signal, and wherein the reference TDDconfiguration information indicates at least one of the TDDconfiguration 2, 4, or 5.